diff --git a/NAMESPACE b/NAMESPACE
index 1cd1648..78a985d 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -7,5 +7,6 @@ export(az_daily)
 export(az_heat)
 export(az_hourly)
 export(az_lw15min)
+export(az_lwdaily)
 importFrom(magrittr,"%>%")
 importFrom(rlang,.data)
diff --git a/NEWS.md b/NEWS.md
index 0860530..8e228fa 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,6 @@
 # azmetr (development version)
 
+- Added function `az_lwdaily()` for downloading daily leaf wetness data, which now are available via the API
 - Added function `az_lw15min()` for downloading 15-minute (a.k.a. "real-time") leaf wetness data, which now are available via the API
 - Added function `az_15min()` for downloading 15-minute (a.k.a. "real-time") data, which now are available via the API
 
diff --git a/R/az_15min.R b/R/az_15min.R
index 8a96cb4..e90c453 100755
--- a/R/az_15min.R
+++ b/R/az_15min.R
@@ -1,7 +1,8 @@
 #' Retrieve 15-minute Weather Data from AZMet
 #'
 #' Retrieves 15-minute data from the AZMet (Arizona Meteorological Network) API.
-#' For a list of weather stations and their locations see [station_info].
+#' For a list of weather stations and their locations see [station_info], or
+#' visit https://azmet.arizona.edu/about.
 #'
 #' @param station_id Station ID can be supplied as numeric vector (e.g.
 #'   `station_id = c(8, 37)`) or as character vector with the prefix "az" and
@@ -16,7 +17,7 @@
 #'   Defaults to the current date and time if left blank and `start_date_time`
 #'   is specified.
 #' @details If neither `start_date_time` nor `end_date_time` are supplied, the
-#'   most recent date-time of data will be returned. If only `start_date_time`
+#'   most recent datetime of data will be returned. If only `start_date_time`
 #'   is supplied, then `end_date_time` defaults to the current time. Supplying
 #'   only `end_date_time` will result in an error.
 #' @note If `station_id` is supplied as a vector, multiple successive calls to
@@ -24,9 +25,9 @@
 #'   the stations by leaving `station_id` blank and subsetting the resulting
 #'   dataframe. Only the most recent 48 hours of 15-minute data are stored in
 #'   the AZMet API.
-#' @return a tibble. For units and other metadata, see
+#' @return A tibble. For units and other metadata, see
 #'   <https://azmet.arizona.edu/about>
-#' @seealso [az_daily()], [az_heat()], [az_hourly()], [az_lw15min()]
+#' @seealso [az_daily()], [az_heat()], [az_hourly()], [az_lw15min()], [az_lwdaily()]
 #' @source <https://azmet.arizona.edu/>
 #' @importFrom rlang .data
 #' @export
@@ -71,7 +72,7 @@ az_15min <- function(station_id = NULL, start_date_time = NULL, end_date_time =
   # Query API ------------------------------------------------------------------
 
   if (is.null(start_date_time) & is.null(end_date_time)) {
-    message("Querying most recent date-time of 15-minute data ...")
+    message("Querying most recent datetime of 15-minute data ...")
   } else {
     message(
       "Querying data from ", format(params$start, "%Y-%m-%d %H:%M:%S")," through ", format(params$end, "%Y-%m-%d %H:%M:%S"), " ..."
@@ -110,7 +111,7 @@ az_15min <- function(station_id = NULL, start_date_time = NULL, end_date_time =
   }
 
   if (nrow(out) == 0) {
-    warning("No data retrieved from API.")
+    warning("No data retrieved from API")
     # Return 0x0 tibble
     return(tibble::tibble())
   }
diff --git a/R/az_add_units.R b/R/az_add_units.R
index 996b344..29963e8 100644
--- a/R/az_add_units.R
+++ b/R/az_add_units.R
@@ -3,9 +3,9 @@
 #' Assigns correct units to the output of `az_hourly()`, `az_daily()`, and
 #' `az_heat()` using the `units` package.
 #'
-#' @param x a tibble output by [az_hourly()], [az_daily()], or [az_heat()]
+#' @param x A tibble output by [az_hourly()], [az_daily()], or [az_heat()]
 #'
-#' @return a tibble with columns of class "units"
+#' @return A tibble with columns of class "units"
 #' @export
 #'
 #' @examples
diff --git a/R/az_daily.R b/R/az_daily.R
index 7bb2232..b334475 100644
--- a/R/az_daily.R
+++ b/R/az_daily.R
@@ -1,31 +1,35 @@
 #' Retrieve Daily Weather Data from AZMET
 #'
 #' Retrieves daily data from the Arizona Meteorological Network API. For a list
-#' of weather stations and their locations see [station_info].
+#' of weather stations and their locations see [station_info], or visit
+#' https://azmet.arizona.edu/about.
 #'
 #' @param station_id station ID can be supplied as numeric vector (e.g.
-#'   `station_id = c(8, 37)`) or as character vector with the prefix "az" and 2
-#'   digits (e.g. `station_id = c("az08", "az37")`) If left blank data for all
-#'   stations will be returned
+#'   `station_id = c(8, 37)`) or as character vector with the prefix "az" and
+#'   two digits (e.g. `station_id = c("az08", "az37")`). If left blank, data for all
+#'   stations will be returned.
 #' @param start_date A length-1 vector of class Date, POSIXct, or character in
-#'   YYYY-MM-DD format.  Will be rounded **down** to the nearest day if more
-#'   precision is supplied.
+#'   YYYY-MM-DD format. Will be rounded **down** to the nearest day if more
+#'   precision is supplied. Defaults to the day before the current date (i.e.,
+#'   the most recent complete day) if left blank.
 #' @param end_date A length-1 vector of class Date, POSIXct, or character in
-#'   YYYY-MM-DD format.  Will be rounded **down** to the nearest day if more
-#'   precision is supplied.  Defaults to the current date if left blank.
+#'   YYYY-MM-DD format. Will be rounded **down** to the nearest day if more
+#'   precision is supplied. Defaults to the day before the current date (i.e.,
+#'   the most recent complete day) if left blank.
 #' @details If neither `start_date` nor `end_date` are supplied, the most recent
-#'   day of data will be returned.  If only `start_date` is supplied, then the
-#'   end date defaults to the current date.  Supplying only `end_date` will
+#'   day of data will be returned. If only `start_date` is supplied, then the
+#'   end date defaults to the day before the current date (i.e.,
+#'   the most recent complete day). Supplying only `end_date` will
 #'   result in an error.
 #' @note If `station_id` is supplied as a vector, multiple successive calls to
 #'   the API will be made. You may find better performance getting data for all
 #'   the stations by leaving `station_id` blank and subsetting the resulting
 #'   dataframe. Requests for data from all stations for more than 6-12 months
 #'   may take considerable time.
-#' @return a tibble. For units and other metadata, see
-#'   <https://ag.arizona.edu/azmet/raw2003.htm>
-#' @seealso [az_15min()], [az_heat()], [az_hourly()], [az_lw15min()]
-#' @source <https://ag.arizona.edu/azmet/>
+#' @return A tibble. For units and other metadata, see
+#'   <https://azmet.arizona.edu/about>
+#' @seealso [az_15min()], [az_heat()], [az_hourly()], [az_lw15min()], [az_lwdaily()]
+#' @source <https://azmet.arizona.edu/>
 #'
 #' @importFrom rlang .data
 #' @export
@@ -43,18 +47,31 @@
 #' az_daily(start_date = "2022-09-25")
 #' az_daily(start_date = "2022-09-25", end_date = "2022-09-26")
 #' }
-#'
+
+
 az_daily <- function(station_id = NULL, start_date = NULL, end_date = NULL) {
 
-  #TODO: check for valid station IDs
+  # TODO: check for valid station IDs
   check_internet()
+
   if(!is.null(end_date) & is.null(start_date)) {
     stop("If you supply `end_date`, you must also supply `start_date`")
   }
+
   params <-
-    parse_params(station_id = station_id, start = start_date, end = end_date)
+    parse_params(
+      station_id = station_id,
+      start = start_date,
+      end = end_date,
+      hour = FALSE,
+      real_time = FALSE
+    )
+
+  tz = "America/Phoenix"
+
+
+  # Query API  -----------------------------------------------------------------
 
-  # Query API  --------------------------------------------
   if (is.null(start_date) & is.null(end_date)) {
     message("Querying data from ", params$start)
   } else {
@@ -63,42 +80,48 @@ az_daily <- function(station_id = NULL, start_date = NULL, end_date = NULL) {
 
   if (length(station_id) <= 1) {
     out <-
-      retrieve_data(params$station_id,
-                    params$start_f,
-                    params$time_interval,
-                    endpoint = "daily")
+      retrieve_data(
+        params$station_id,
+        params$start_f,
+        params$time_interval,
+        endpoint = "daily"
+      )
   } else if (length(station_id) > 1) {
     out <-
       purrr::map_df(
         params$station_id,
         function(x) {
-          retrieve_data(x,
-                        params$start_f,
-                        params$time_interval,
-                        endpoint = "daily")
+          retrieve_data(
+            x,
+            params$start_f,
+            params$time_interval,
+            endpoint = "daily"
+          )
         }
       )
   }
 
   if (nrow(out) == 0) {
     warning("No data retrieved from API")
-    #return 0x0 tibble for type consistency
+    # Return 0x0 tibble for type consistency
     return(tibble::tibble())
   }
 
-  #Check if any data is missing
+  # Check if any data are missing
   n_obs <- out %>%
     dplyr::summarise(n = dplyr::n(), .by = dplyr::all_of("meta_station_id")) %>%
     dplyr::filter(.data$n < as.numeric(lubridate::period(params$time_interval), "day") + 1)
   if (nrow(n_obs) != 0 |
      # Also warn if the missing data is just at the end
-     lubridate::ymd(max(out$datetime), tz = "America/Phoenix") < params$end) {
-    warning("Some requested data were unavailable")
+     lubridate::ymd(max(out$datetime), tz = tz) < params$end) {
+    warning("Some requested data were unavailable.")
   }
 
-  # Wrangle output ----------------------------------------------------------
+
+  # Wrangle output -------------------------------------------------------------
+
   out <- out %>%
-    #move metadata to beginning
+    # Move metadata to beginning
     dplyr::select(dplyr::starts_with("meta_"), dplyr::everything()) %>%
     dplyr::mutate(dplyr::across(
       c(-"meta_station_id", -"meta_station_name", -"datetime", -"wind_2min_timestamp"),
@@ -106,7 +129,7 @@ az_daily <- function(station_id = NULL, start_date = NULL, end_date = NULL) {
     )) %>%
     dplyr::filter(.data$meta_station_id != "az99") %>%
     dplyr::mutate(datetime = lubridate::ymd(.data$datetime)) %>%
-    #convert NAs
+    # Convert NAs
     dplyr::mutate(
       dplyr::across(
         tidyselect::where(is.numeric),
@@ -124,7 +147,7 @@ az_daily <- function(station_id = NULL, start_date = NULL, end_date = NULL) {
     dplyr::mutate(
       wind_2min_timestamp = lubridate::with_tz(
         lubridate::parse_date_time(.data$wind_2min_timestamp, orders = "ymdHMSz"),
-        tzone = "America/Phoenix"
+        tzone = tz
       )
     )
 
diff --git a/R/az_heat.R b/R/az_heat.R
index a6b1194..6250e86 100644
--- a/R/az_heat.R
+++ b/R/az_heat.R
@@ -1,9 +1,10 @@
 #' Retrieve Accumulated Heat Units and Evapotranspiration
 #'
 #' Retrieves accumulated heat units and reference evapotranspiration units from
-#' the Arizona Meteorological Network API.  By default, returned values are
+#' the Arizona Meteorological Network API. By default, returned values are
 #' cumulative since January 1 of the current year. For a list of weather
-#' stations and their locations see [station_info].
+#' stations and their locations see [station_info], or visit
+#' https://azmet.arizona.edu/about.
 #'
 #' @param station_id station ID can be supplied as numeric vector (e.g.
 #'   `station_id = c(8, 37)`) or as character vector with the prefix "az" and 2
@@ -24,10 +25,10 @@
 #'   the API will be made.  You may find better performance getting data for all
 #'   the stations by leaving `station_id` blank and subsetting the resulting
 #'   dataframe.
-#' @return a tibble. For units and other metadata, see
-#'   <https://ag.arizona.edu/azmet/raw2003.htm>
-#' @seealso [az_15min()], [az_daily()], [az_hourly()], [az_lw15min()]
-#' @source <https://ag.arizona.edu/azmet/>
+#' @return A tibble. For units and other metadata, see
+#'   <https://azmet.arizona.edu/about>
+#' @seealso [az_15min()], [az_daily()], [az_hourly()], [az_lw15min()], [az_lwdaily()]
+#' @source <https://azmet.arizona.edu/>
 #' @importFrom rlang .data
 #' @export
 #'
@@ -52,8 +53,8 @@
 #'
 az_heat <- function(station_id = NULL, start_date = NULL, end_date = NULL) {
   tz <- "America/Phoenix"
-  #TODO: document output columns or link to API docs if appropriate
-  #TODO: check for valid station IDs
+  # TODO: document output columns or link to API docs if appropriate
+  # TODO: check for valid station IDs
   check_internet()
   # If no start date supplied, default is Jan 1 of current year.
   if (is.null(start_date)) {
diff --git a/R/az_hourly.R b/R/az_hourly.R
index e81e40c..c11ac3f 100644
--- a/R/az_hourly.R
+++ b/R/az_hourly.R
@@ -1,11 +1,12 @@
 #' Retrieve Hourly Weather Data
 #'
 #' Retrieves hourly weather data from the Arizona Meteorological Network API.
-#' For a list of weather stations and their locations see [station_info].
+#' For a list of weather stations and their locations see [station_info], or
+#' visit https://azmet.arizona.edu/about.
 #'
 #' @param station_id station ID can be supplied as numeric vector (e.g.
 #'   `station_id = c(8, 37)`) or as character vector with the prefix "az" and 2
-#'   digits (e.g. `station_id = c("az08", "az37")`) If left blank data for all
+#'   digits (e.g. `station_id = c("az08", "az37")`) If left blank, data for all
 #'   stations will be returned
 #' @param start_date_time A length-1 vector of class POSIXct or character in
 #'   YYYY-MM-DD HH format, in AZ time.  Will be rounded **down** to the nearest
@@ -26,10 +27,10 @@
 #'   the stations by leaving `station_id` blank and subsetting the resulting
 #'   dataframe. Requests for data from all stations for more than 10-15 days may
 #'   take considerable time.
-#' @return a tibble. For units and other metadata, see
-#'   <https://ag.arizona.edu/azmet/raw2003.htm>
-#' @seealso [az_15min()], [az_daily()], [az_heat()], [az_lw15min()]
-#' @source <https://ag.arizona.edu/azmet/>
+#' @return A tibble. For units and other metadata, see
+#'   <https://azmet.arizona.edu/about>
+#' @seealso [az_15min()], [az_daily()], [az_heat()], [az_lw15min()], [az_lwdaily()]
+#' @source <https://azmet.arizona.edu/>
 #' @importFrom rlang .data
 #' @export
 #'
@@ -49,7 +50,7 @@
 #'
 az_hourly <- function(station_id = NULL, start_date_time = NULL, end_date_time = NULL) {
 
-  #TODO: check for valid station IDs
+  # TODO: check for valid station IDs
   check_internet()
   if(!is.null(end_date_time) & is.null(start_date_time)) {
     stop("If you supply `end_date_time`, you must also supply `start_date_time`")
diff --git a/R/az_lw15min.R b/R/az_lw15min.R
index de0e750..464310d 100644
--- a/R/az_lw15min.R
+++ b/R/az_lw15min.R
@@ -1,8 +1,9 @@
 #' Retrieve 15-minute Leaf Wetness Data from AZMet
 #'
 #' Retrieves 15-minute leaf-wetness data from the AZMet (Arizona Meteorological
-#' Network) API. Currently, these data only are available from stations in the
-#' Yuma area. For a list of stations and their locations see [station_info].
+#' Network) API. Currently, these data only are available from weather stations
+#' in the Yuma area. For a list of stations and their locations see
+#' [station_info], or visit https://azmet.arizona.edu/about.
 #'
 #' @param station_id Station ID can be supplied as numeric vector (e.g.
 #'   `station_id = c(8, 37)`) or as character vector with the prefix "az" and
@@ -17,7 +18,7 @@
 #'   Defaults to the current date and time if left blank and `start_date_time`
 #'   is specified.
 #' @details If neither `start_date_time` nor `end_date_time` are supplied, the
-#'   most recent date-time of data will be returned. If only `start_date_time`
+#'   most recent datetime of data will be returned. If only `start_date_time`
 #'   is supplied, then `end_date_time` defaults to the current time. Supplying
 #'   only `end_date_time` will result in an error.
 #' @note If `station_id` is supplied as a vector, multiple successive calls to
@@ -25,9 +26,9 @@
 #'   the stations by leaving `station_id` blank and subsetting the resulting
 #'   dataframe. Only the most recent 48 hours of 15-minute data are stored in
 #'   the AZMet API.
-#' @return a tibble. For units and other metadata, see
+#' @return A tibble. For units and other metadata, see
 #'   <https://azmet.arizona.edu/about>
-#' @seealso [az_15min()], [az_daily()], [az_heat()], [az_hourly()]
+#' @seealso [az_15min()], [az_daily()], [az_heat()], [az_hourly()], [az_lwdaily()]
 #' @source <https://azmet.arizona.edu/>
 #' @importFrom rlang .data
 #' @export
@@ -72,7 +73,7 @@ az_lw15min <- function(station_id = NULL, start_date_time = NULL, end_date_time
   # Query API ------------------------------------------------------------------
 
   if (is.null(start_date_time) & is.null(end_date_time)) {
-    message("Querying most recent date-time of leaf wetness 15-minute data ...")
+    message("Querying most recent datetime of leaf wetness 15-minute data ...")
   } else {
     message(
       "Querying data from ", format(params$start, "%Y-%m-%d %H:%M:%S")," through ", format(params$end, "%Y-%m-%d %H:%M:%S"), " ..."
@@ -111,7 +112,7 @@ az_lw15min <- function(station_id = NULL, start_date_time = NULL, end_date_time
   }
 
   if (nrow(out) == 0) {
-    warning("No data retrieved from API.")
+    warning("No data retrieved from API")
     # Return 0x0 tibble
     return(tibble::tibble())
   }
diff --git a/R/az_lwdaily.R b/R/az_lwdaily.R
new file mode 100644
index 0000000..e412b21
--- /dev/null
+++ b/R/az_lwdaily.R
@@ -0,0 +1,146 @@
+#' Retrieve Daily Leaf Wetness Data from AZMet
+#'
+#' Retrieves daily leaf wetness data from the Arizona Meteorological Network
+#' API. Currently, these data only are available from weather stations in the
+#' Yuma area. For a list of stations and their locations see [station_info], or
+#' visit https://azmet.arizona.edu/about.
+#'
+#' @param station_id station ID can be supplied as numeric vector (e.g.
+#'   `station_id = c(8, 37)`) or as character vector with the prefix "az" and
+#'   two digits (e.g. `station_id = c("az08", "az37")`). If left blank, data for
+#'   all stations will be returned.
+#' @param start_date A length-1 vector of class Date, POSIXct, or character in
+#'   YYYY-MM-DD format. Will be rounded **down** to the nearest day if more
+#'   precision is supplied. Defaults to the day before the current date (i.e.,
+#'   the most recent complete day) if left blank.
+#' @param end_date A length-1 vector of class Date, POSIXct, or character in
+#'   YYYY-MM-DD format. Will be rounded **down** to the nearest day if more
+#'   precision is supplied. Defaults to the day before the current date (i.e.,
+#'   the most recent complete day) if left blank.
+#' @details If neither `start_date` nor `end_date` are supplied, the most recent
+#'   day of data will be returned. If only `start_date` is supplied, then the
+#'   end date defaults to the day before the current date (i.e., the most recent
+#'   complete day). Supplying only `end_date` will result in an error.
+#' @note If `station_id` is supplied as a vector, multiple successive calls to
+#'   the API will be made. You may find better performance getting data for all
+#'   the stations by leaving `station_id` blank and subsetting the resulting
+#'   dataframe. Requests for data from all stations for more than 6-12 months
+#'   may take considerable time.
+#' @return A tibble. For units and other metadata, see
+#'   <https://azmet.arizona.edu/about>
+#' @seealso [az_15min()], [az_daily()], [az_heat()], [az_hourly()], [az_lw15min()]
+#' @source <https://azmet.arizona.edu/>
+#'
+#' @importFrom rlang .data
+#' @export
+#'
+#' @examples
+#' \dontrun{
+#' # Most recent data for all stations:
+#' az_lwdaily()
+#'
+#' # Specify stations:
+#' az_lwdaily(station_id = c(1, 2))
+#' az_lwdaily(station_id = c("az01", "az02"))
+#'
+#' # Specify dates:
+#' az_lwdaily(start_date = "2022-09-25")
+#' az_lwdaily(start_date = "2022-09-25", end_date = "2022-09-26")
+#' }
+
+
+az_lwdaily <- function(station_id = NULL, start_date = NULL, end_date = NULL) {
+
+  # TODO: check for valid station IDs
+  check_internet()
+
+  if(!is.null(end_date) & is.null(start_date)) {
+    stop("If you supply `end_date`, you must also supply `start_date`.")
+  }
+
+  params <-
+    parse_params(
+      station_id = station_id,
+      start = start_date,
+      end = end_date,
+      hour = FALSE,
+      real_time = FALSE
+    )
+
+
+  # Query API  -----------------------------------------------------------------
+
+  if (is.null(start_date) & is.null(end_date)) {
+    message("Querying data from ", params$start, " ...")
+  } else {
+    message("Querying data from ", params$start, " through ", params$end, " ...")
+  }
+
+  if (length(station_id) <= 1) {
+    out <-
+      retrieve_data(
+        params$station_id,
+        params$start_f,
+        params$time_interval,
+        endpoint = "lwdaily"
+      )
+  } else if (length(station_id) > 1) {
+    out <-
+      purrr::map_df(
+        params$station_id,
+        function(x) {
+          retrieve_data(
+            x,
+            params$start_f,
+            params$time_interval,
+            endpoint = "lwdaily"
+          )
+        }
+      )
+  }
+
+  if (nrow(out) == 0) {
+    warning("No data retrieved from API")
+    # Return 0x0 tibble for type consistency
+    return(tibble::tibble())
+  }
+
+  # Check if any data are missing
+  n_obs <- out %>%
+    dplyr::summarise(n = dplyr::n(), .by = dplyr::all_of("meta_station_id")) %>%
+    dplyr::filter(.data$n < as.numeric(lubridate::period(params$time_interval), "day") + 1)
+  if (nrow(n_obs) != 0 |
+     # Also warn if the missing data is just at the end
+     lubridate::ymd(max(out$date)) < params$end) {
+    warning("Some requested data were unavailable.")
+  }
+
+
+  # Wrangle output -------------------------------------------------------------
+
+  out <- out %>%
+    # Move metadata to beginning
+    dplyr::select(dplyr::starts_with("meta_"), dplyr::everything()) %>%
+    dplyr::mutate(dplyr::across(
+      c(-"meta_station_id", -"meta_station_name", -"date", -"datetime"),
+      as.numeric
+    )) %>%
+    dplyr::filter(.data$meta_station_id != "az99") %>%
+    dplyr::mutate(date = lubridate::ymd(.data$date)) %>%
+    dplyr::mutate(datetime = lubridate::ymd_hms(.data$datetime, tz = "America/Phoenix")) %>%
+    # Convert NAs
+    dplyr::mutate(
+      dplyr::across(
+        tidyselect::where(is.numeric),
+        function(x)
+          dplyr::if_else(x %in% c(-999, -9999, -99999, -7999, 999, 999.9, 9999), NA_real_, x)
+      )
+    )
+
+  if (length(unique(out$date)) == 1) {
+    message("Returning data from ", unique(out$date))
+  } else {
+    message("Returning data from ", min(out$date), " through ", max(out$date))
+  }
+  return(out)
+}
diff --git a/R/parse_params.R b/R/parse_params.R
index a987fff..9c7f9c3 100644
--- a/R/parse_params.R
+++ b/R/parse_params.R
@@ -3,14 +3,14 @@
 #' @param station_id character or numeric vector
 #' @param start start date or date time
 #' @param end end date or date time
-#' @param hour logical; do `start` and `end` contain hours?
+#' @param hour logical; is request for hourly data?
 #' @param real_time logical; is request for real-time data?
 #'
 #' @note If `hour = TRUE`, `start` and `end` can be character or POSIXct and
-#'   will be rounded **down** to the nearest hour.  If character, then they must
+#'   will be rounded **down** to the nearest hour. If character, then they must
 #'   at least contain the hour (e.g. "2022-01-12 13" for 1pm on Jan 12, 2022).
 #'   If `hour = FALSE` then class Date is also accepted and values will be
-#'   rounded **down** to the nearest whole day.  Dates and times should be in
+#'   rounded **down** to the nearest whole day. Dates and times should be in
 #'   Arizona time.
 #'
 #' @return a list
@@ -59,18 +59,19 @@ parse_params <- function(station_id, start, end, hour = FALSE, real_time = FALSE
   # start_f/time_interval: what is actually passed to the API
   #########################################
 
+
   if (is.null(end)) {
     if (isTRUE(hour)) { # Hourly data
       end_ <- format( # Keep as character until later, for consistency
         lubridate::floor_date(lubridate::now(tzone = tz), "hour"),
         "%Y-%m-%d %H:%M:%S"
       )
-    } else if (isTRUE(real_time)) { # 15min data
+    } else if (isTRUE(real_time)) { # 15min data, both weather and leaf wetness
       end_ <- format( # Keep as character until later, for consistency
         lubridate::now(tzone = tz),
         "%Y-%m-%d %H:%M:%S"
       )
-    } else { # Daily data
+    } else { # Daily weather and leaf wetness data
       end_ <- format( # Keep as character until later, for consistency
         lubridate::today(tzone = tz) - lubridate::days(1),
         "%Y-%m-%d %H:%M:%S"
@@ -80,12 +81,12 @@ parse_params <- function(station_id, start, end, hour = FALSE, real_time = FALSE
     # For hourly, if only ymd is supplied to `end`, round up to end of day. On a
     # given day, hourly data go from 1:00:00 to 23:59:59. For 15min, if only ymd
     # is supplied to `end`, set to current Arizona time. On a given day, 15 min
-    # data go from 00:00:01 to 23:59:59
+    # data go from 00:00:00 to 23:59:59
     if (isTRUE(hour) & is_ymd(end)) { # Hourly data
       end_ <- paste(end, "23:59:59")
     } else if (isTRUE(real_time) & is_ymd(end)) { # 15min data
       end_ <- paste(end, format(lubridate::now(tzone = tz), "%H:%M:%S"))
-    } else { # Daily data
+    } else { # Daily weather data
       end_ <- end
     }
   }
@@ -101,7 +102,7 @@ parse_params <- function(station_id, start, end, hour = FALSE, real_time = FALSE
         lubridate::now(tzone = tz) - lubridate::minutes(15),
         "%Y-%m-%d %H:%M:%S"
       )
-    } else { # Daily data
+    } else { # Daily weather data
       start_ <- format( # Keep as character until later, for consistency
         lubridate::today(tzone = tz) - lubridate::days(1),
         "%Y-%m-%d"
@@ -111,8 +112,8 @@ parse_params <- function(station_id, start, end, hour = FALSE, real_time = FALSE
     if (isTRUE(hour) & is_ymd(start)) { # Hourly data
       start_ <- paste(start, "01:00:00")
     } else if (isTRUE(real_time) & is_ymd(start)) { # 15min data
-      start_ <- paste(start, "00:00:01")
-    } else { # Daily data
+      start_ <- paste(start, "00:00:00")
+    } else { # Daily weather and leaf wetness data
       start_ <- start
     }
   }
@@ -135,7 +136,7 @@ parse_params <- function(station_id, start, end, hour = FALSE, real_time = FALSE
       lubridate::parse_date_time(x, orders = c("YmdHMS", "YmdHM", "YmdH", "Ymd"), tz = tz) %>%
         lubridate::floor_date(unit = "secs")
     }
-  } else { # Daily data
+  } else { # Daily weather data
     parse_fun <- function(x, end = FALSE) {
       lubridate::parse_date_time(x, orders = c("Ymd", "YmdHMS", "YmdHM", "YmdH"), tz = tz) %>%
         lubridate::floor_date(unit = "day") %>%
@@ -193,7 +194,7 @@ parse_params <- function(station_id, start, end, hour = FALSE, real_time = FALSE
     if (end_parsed < start_parsed) {
       stop("`end_date_time` is before `start_date_time`!")
     }
-  } else { # Daily data
+  } else { # Daily weather and leaf wetness data
     if (!is.null(start) & start_parsed >= lubridate::today(tzone = tz)) {
       stop("Please supply a `start_date` earlier than today.")
     }
@@ -219,13 +220,27 @@ parse_params <- function(station_id, start, end, hour = FALSE, real_time = FALSE
   # as one full hour.
   if (is.null(start)) {
     time_interval <- "*"
-  } else {
+  } else if (real_time == FALSE) {
     end_rounded <- lubridate::round_date(end_parsed, unit = "hour")
     start_rounded <- lubridate::round_date(start_parsed, unit = "hour")
     d <- lubridate::as.period(end_rounded - start_rounded)
     time_interval <- lubridate::format_ISO8601(d)
+  } else { # real_time == TRUE
+    end_rounded <- lubridate::round_date(end_parsed, unit = "minute")
+    start_rounded <- lubridate::round_date(start_parsed, unit = "minute")
+    d <- lubridate::as.period(end_parsed - start_parsed)
+    time_interval <- lubridate::format_ISO8601(d)
   }
 
+  #if (is.null(start)) {
+  #  time_interval <- "*"
+  #} else {
+  #  end_rounded <- lubridate::round_date(end_parsed, unit = "hour")
+  #  start_rounded <- lubridate::round_date(start_parsed, unit = "hour")
+  #  d <- lubridate::as.period(end_rounded - start_rounded)
+  #  time_interval <- lubridate::format_ISO8601(d)
+  #}
+
   # Return list
 
   # URLencode isn't strictly necessary, but it'll make the correct error print
diff --git a/R/retrieve_data.R b/R/retrieve_data.R
index 1477f6e..a166298 100644
--- a/R/retrieve_data.R
+++ b/R/retrieve_data.R
@@ -3,7 +3,7 @@
 #' @param station_id character; in the format of "az01"
 #' @param start_f character; ISO formatted date time string
 #' @param time_interval character; ISO8601 formatted time interval string
-#' @param endpoint character; one of "daily", "hourly", "hueto", or "fifteen"
+#' @param endpoint character; one of "15min", "daily", "hourly", "hueto", "lw15min", or "lwdaily"
 #' @param print_call logical; when TRUE, prints the HTTP request to the AZMet API
 #'
 #' @return tibble
@@ -15,7 +15,7 @@ retrieve_data <-
     station_id,
     start_f,
     time_interval,
-    endpoint = c("15min", "daily", "hourly", "hueto", "lw15min"),
+    endpoint = c("15min", "daily", "hourly", "hueto", "lw15min", "lwdaily"),
     print_call = getOption("azmet.print_api_call")
   ) {
 
@@ -43,9 +43,9 @@ retrieve_data <-
 
   data_tidy <- data_raw$data %>%
     purrr::compact() %>%
-    purrr::map(purrr::compact) %>% #removes any columns that are NULL (i.e. no data)
+    purrr::map(purrr::compact) %>% # Removes any columns that are NULL (i.e. no data)
     purrr::map(tibble::as_tibble) %>%
-    purrr::list_rbind() # missing columns for individual sites will be all NAs
+    purrr::list_rbind() # Missing columns for individual sites will be all NAs
 
   attributes(data_tidy) <-
     append(
@@ -54,5 +54,5 @@ retrieve_data <-
     )
   data_tidy
 
-  #TODO: Check for 0x0 tibble and error
+  # TODO: Check for 0x0 tibble and error
 }
diff --git a/man/az_15min.Rd b/man/az_15min.Rd
index 7b0d9ad..d7182a2 100644
--- a/man/az_15min.Rd
+++ b/man/az_15min.Rd
@@ -26,16 +26,17 @@ Defaults to the current date and time if left blank and \code{start_date_time}
 is specified.}
 }
 \value{
-a tibble. For units and other metadata, see
+A tibble. For units and other metadata, see
 \url{https://azmet.arizona.edu/about}
 }
 \description{
 Retrieves 15-minute data from the AZMet (Arizona Meteorological Network) API.
-For a list of weather stations and their locations see \link{station_info}.
+For a list of weather stations and their locations see \link{station_info}, or
+visit https://azmet.arizona.edu/about.
 }
 \details{
 If neither \code{start_date_time} nor \code{end_date_time} are supplied, the
-most recent date-time of data will be returned. If only \code{start_date_time}
+most recent datetime of data will be returned. If only \code{start_date_time}
 is supplied, then \code{end_date_time} defaults to the current time. Supplying
 only \code{end_date_time} will result in an error.
 }
@@ -61,5 +62,5 @@ az_15min(start_date_time = "2022-09-25 01:00:00", end_date_time = "2022-09-25 07
 }
 }
 \seealso{
-\code{\link[=az_daily]{az_daily()}}, \code{\link[=az_heat]{az_heat()}}, \code{\link[=az_hourly]{az_hourly()}}, \code{\link[=az_lw15min]{az_lw15min()}}
+\code{\link[=az_daily]{az_daily()}}, \code{\link[=az_heat]{az_heat()}}, \code{\link[=az_hourly]{az_hourly()}}, \code{\link[=az_lw15min]{az_lw15min()}}, \code{\link[=az_lwdaily]{az_lwdaily()}}
 }
diff --git a/man/az_add_units.Rd b/man/az_add_units.Rd
index 8bd8291..81435c4 100644
--- a/man/az_add_units.Rd
+++ b/man/az_add_units.Rd
@@ -7,10 +7,10 @@
 az_add_units(x)
 }
 \arguments{
-\item{x}{a tibble output by \code{\link[=az_hourly]{az_hourly()}}, \code{\link[=az_daily]{az_daily()}}, or \code{\link[=az_heat]{az_heat()}}}
+\item{x}{A tibble output by \code{\link[=az_hourly]{az_hourly()}}, \code{\link[=az_daily]{az_daily()}}, or \code{\link[=az_heat]{az_heat()}}}
 }
 \value{
-a tibble with columns of class "units"
+A tibble with columns of class "units"
 }
 \description{
 Assigns correct units to the output of \code{az_hourly()}, \code{az_daily()}, and
diff --git a/man/az_daily.Rd b/man/az_daily.Rd
index 94ddc5c..036ed70 100644
--- a/man/az_daily.Rd
+++ b/man/az_daily.Rd
@@ -4,37 +4,41 @@
 \alias{az_daily}
 \title{Retrieve Daily Weather Data from AZMET}
 \source{
-\url{https://ag.arizona.edu/azmet/}
+\url{https://azmet.arizona.edu/}
 }
 \usage{
 az_daily(station_id = NULL, start_date = NULL, end_date = NULL)
 }
 \arguments{
 \item{station_id}{station ID can be supplied as numeric vector (e.g.
-\code{station_id = c(8, 37)}) or as character vector with the prefix "az" and 2
-digits (e.g. \code{station_id = c("az08", "az37")}) If left blank data for all
-stations will be returned}
+\code{station_id = c(8, 37)}) or as character vector with the prefix "az" and
+two digits (e.g. \code{station_id = c("az08", "az37")}). If left blank, data for all
+stations will be returned.}
 
 \item{start_date}{A length-1 vector of class Date, POSIXct, or character in
-YYYY-MM-DD format.  Will be rounded \strong{down} to the nearest day if more
-precision is supplied.}
+YYYY-MM-DD format. Will be rounded \strong{down} to the nearest day if more
+precision is supplied. Defaults to the day before the current date (i.e.,
+the most recent complete day) if left blank.}
 
 \item{end_date}{A length-1 vector of class Date, POSIXct, or character in
-YYYY-MM-DD format.  Will be rounded \strong{down} to the nearest day if more
-precision is supplied.  Defaults to the current date if left blank.}
+YYYY-MM-DD format. Will be rounded \strong{down} to the nearest day if more
+precision is supplied. Defaults to the day before the current date (i.e.,
+the most recent complete day) if left blank.}
 }
 \value{
-a tibble. For units and other metadata, see
-\url{https://ag.arizona.edu/azmet/raw2003.htm}
+A tibble. For units and other metadata, see
+\url{https://azmet.arizona.edu/about}
 }
 \description{
 Retrieves daily data from the Arizona Meteorological Network API. For a list
-of weather stations and their locations see \link{station_info}.
+of weather stations and their locations see \link{station_info}, or visit
+https://azmet.arizona.edu/about.
 }
 \details{
 If neither \code{start_date} nor \code{end_date} are supplied, the most recent
-day of data will be returned.  If only \code{start_date} is supplied, then the
-end date defaults to the current date.  Supplying only \code{end_date} will
+day of data will be returned. If only \code{start_date} is supplied, then the
+end date defaults to the day before the current date (i.e.,
+the most recent complete day). Supplying only \code{end_date} will
 result in an error.
 }
 \note{
@@ -57,8 +61,7 @@ az_daily(station_id = c("az01", "az02"))
 az_daily(start_date = "2022-09-25")
 az_daily(start_date = "2022-09-25", end_date = "2022-09-26")
 }
-
 }
 \seealso{
-\code{\link[=az_15min]{az_15min()}}, \code{\link[=az_heat]{az_heat()}}, \code{\link[=az_hourly]{az_hourly()}}, \code{\link[=az_lw15min]{az_lw15min()}}
+\code{\link[=az_15min]{az_15min()}}, \code{\link[=az_heat]{az_heat()}}, \code{\link[=az_hourly]{az_hourly()}}, \code{\link[=az_lw15min]{az_lw15min()}}, \code{\link[=az_lwdaily]{az_lwdaily()}}
 }
diff --git a/man/az_heat.Rd b/man/az_heat.Rd
index effa42c..6d02d8c 100644
--- a/man/az_heat.Rd
+++ b/man/az_heat.Rd
@@ -4,7 +4,7 @@
 \alias{az_heat}
 \title{Retrieve Accumulated Heat Units and Evapotranspiration}
 \source{
-\url{https://ag.arizona.edu/azmet/}
+\url{https://azmet.arizona.edu/}
 }
 \usage{
 az_heat(station_id = NULL, start_date = NULL, end_date = NULL)
@@ -26,14 +26,15 @@ an \code{end_date} is supplied, then data will be cumulative from the start of
 the year of \code{end_date}.}
 }
 \value{
-a tibble. For units and other metadata, see
-\url{https://ag.arizona.edu/azmet/raw2003.htm}
+A tibble. For units and other metadata, see
+\url{https://azmet.arizona.edu/about}
 }
 \description{
 Retrieves accumulated heat units and reference evapotranspiration units from
-the Arizona Meteorological Network API.  By default, returned values are
+the Arizona Meteorological Network API. By default, returned values are
 cumulative since January 1 of the current year. For a list of weather
-stations and their locations see \link{station_info}.
+stations and their locations see \link{station_info}, or visit
+https://azmet.arizona.edu/about.
 }
 \details{
 Unlike \code{\link[=az_daily]{az_daily()}}, only one row of data per station is returned,
@@ -67,5 +68,5 @@ az_heat(end_date = paste(yr, "03", "31", sep = "-"))
 
 }
 \seealso{
-\code{\link[=az_15min]{az_15min()}}, \code{\link[=az_daily]{az_daily()}}, \code{\link[=az_hourly]{az_hourly()}}, \code{\link[=az_lw15min]{az_lw15min()}}
+\code{\link[=az_15min]{az_15min()}}, \code{\link[=az_daily]{az_daily()}}, \code{\link[=az_hourly]{az_hourly()}}, \code{\link[=az_lw15min]{az_lw15min()}}, \code{\link[=az_lwdaily]{az_lwdaily()}}
 }
diff --git a/man/az_hourly.Rd b/man/az_hourly.Rd
index 9519ea6..72e70f7 100644
--- a/man/az_hourly.Rd
+++ b/man/az_hourly.Rd
@@ -4,7 +4,7 @@
 \alias{az_hourly}
 \title{Retrieve Hourly Weather Data}
 \source{
-\url{https://ag.arizona.edu/azmet/}
+\url{https://azmet.arizona.edu/}
 }
 \usage{
 az_hourly(station_id = NULL, start_date_time = NULL, end_date_time = NULL)
@@ -12,7 +12,7 @@ az_hourly(station_id = NULL, start_date_time = NULL, end_date_time = NULL)
 \arguments{
 \item{station_id}{station ID can be supplied as numeric vector (e.g.
 \code{station_id = c(8, 37)}) or as character vector with the prefix "az" and 2
-digits (e.g. \code{station_id = c("az08", "az37")}) If left blank data for all
+digits (e.g. \code{station_id = c("az08", "az37")}) If left blank, data for all
 stations will be returned}
 
 \item{start_date_time}{A length-1 vector of class POSIXct or character in
@@ -28,12 +28,13 @@ Defaults to the current date and time if left blank and \code{start_date_time}
 is specified.}
 }
 \value{
-a tibble. For units and other metadata, see
-\url{https://ag.arizona.edu/azmet/raw2003.htm}
+A tibble. For units and other metadata, see
+\url{https://azmet.arizona.edu/about}
 }
 \description{
 Retrieves hourly weather data from the Arizona Meteorological Network API.
-For a list of weather stations and their locations see \link{station_info}.
+For a list of weather stations and their locations see \link{station_info}, or
+visit https://azmet.arizona.edu/about.
 }
 \details{
 If neither \code{start_date_time} nor \code{end_date_time} are supplied, the
@@ -64,5 +65,5 @@ az_hourly(start_date_time = "2022-09-25 01", end_date = "2022-09-25 20")
 
 }
 \seealso{
-\code{\link[=az_15min]{az_15min()}}, \code{\link[=az_daily]{az_daily()}}, \code{\link[=az_heat]{az_heat()}}, \code{\link[=az_lw15min]{az_lw15min()}}
+\code{\link[=az_15min]{az_15min()}}, \code{\link[=az_daily]{az_daily()}}, \code{\link[=az_heat]{az_heat()}}, \code{\link[=az_lw15min]{az_lw15min()}}, \code{\link[=az_lwdaily]{az_lwdaily()}}
 }
diff --git a/man/az_lw15min.Rd b/man/az_lw15min.Rd
index 4d4befe..3933e8b 100644
--- a/man/az_lw15min.Rd
+++ b/man/az_lw15min.Rd
@@ -26,17 +26,18 @@ Defaults to the current date and time if left blank and \code{start_date_time}
 is specified.}
 }
 \value{
-a tibble. For units and other metadata, see
+A tibble. For units and other metadata, see
 \url{https://azmet.arizona.edu/about}
 }
 \description{
 Retrieves 15-minute leaf-wetness data from the AZMet (Arizona Meteorological
-Network) API. Currently, these data only are available from stations in the
-Yuma area. For a list of stations and their locations see \link{station_info}.
+Network) API. Currently, these data only are available from weather stations
+in the Yuma area. For a list of stations and their locations see
+\link{station_info}, or visit https://azmet.arizona.edu/about.
 }
 \details{
 If neither \code{start_date_time} nor \code{end_date_time} are supplied, the
-most recent date-time of data will be returned. If only \code{start_date_time}
+most recent datetime of data will be returned. If only \code{start_date_time}
 is supplied, then \code{end_date_time} defaults to the current time. Supplying
 only \code{end_date_time} will result in an error.
 }
@@ -62,5 +63,5 @@ az_lw15min(start_date_time = "2022-09-25 01:00:00", end_date_time = "2022-09-25
 }
 }
 \seealso{
-\code{\link[=az_15min]{az_15min()}}, \code{\link[=az_daily]{az_daily()}}, \code{\link[=az_heat]{az_heat()}}, \code{\link[=az_hourly]{az_hourly()}}
+\code{\link[=az_15min]{az_15min()}}, \code{\link[=az_daily]{az_daily()}}, \code{\link[=az_heat]{az_heat()}}, \code{\link[=az_hourly]{az_hourly()}}, \code{\link[=az_lwdaily]{az_lwdaily()}}
 }
diff --git a/man/az_lwdaily.Rd b/man/az_lwdaily.Rd
new file mode 100644
index 0000000..be7f58c
--- /dev/null
+++ b/man/az_lwdaily.Rd
@@ -0,0 +1,67 @@
+% Generated by roxygen2: do not edit by hand
+% Please edit documentation in R/az_lwdaily.R
+\name{az_lwdaily}
+\alias{az_lwdaily}
+\title{Retrieve Daily Leaf Wetness Data from AZMet}
+\source{
+\url{https://azmet.arizona.edu/}
+}
+\usage{
+az_lwdaily(station_id = NULL, start_date = NULL, end_date = NULL)
+}
+\arguments{
+\item{station_id}{station ID can be supplied as numeric vector (e.g.
+\code{station_id = c(8, 37)}) or as character vector with the prefix "az" and
+two digits (e.g. \code{station_id = c("az08", "az37")}). If left blank, data for
+all stations will be returned.}
+
+\item{start_date}{A length-1 vector of class Date, POSIXct, or character in
+YYYY-MM-DD format. Will be rounded \strong{down} to the nearest day if more
+precision is supplied. Defaults to the day before the current date (i.e.,
+the most recent complete day) if left blank.}
+
+\item{end_date}{A length-1 vector of class Date, POSIXct, or character in
+YYYY-MM-DD format. Will be rounded \strong{down} to the nearest day if more
+precision is supplied. Defaults to the day before the current date (i.e.,
+the most recent complete day) if left blank.}
+}
+\value{
+A tibble. For units and other metadata, see
+\url{https://azmet.arizona.edu/about}
+}
+\description{
+Retrieves daily leaf wetness data from the Arizona Meteorological Network
+API. Currently, these data only are available from weather stations in the
+Yuma area. For a list of stations and their locations see \link{station_info}, or
+visit https://azmet.arizona.edu/about.
+}
+\details{
+If neither \code{start_date} nor \code{end_date} are supplied, the most recent
+day of data will be returned. If only \code{start_date} is supplied, then the
+end date defaults to the day before the current date (i.e., the most recent
+complete day). Supplying only \code{end_date} will result in an error.
+}
+\note{
+If \code{station_id} is supplied as a vector, multiple successive calls to
+the API will be made. You may find better performance getting data for all
+the stations by leaving \code{station_id} blank and subsetting the resulting
+dataframe. Requests for data from all stations for more than 6-12 months
+may take considerable time.
+}
+\examples{
+\dontrun{
+# Most recent data for all stations:
+az_lwdaily()
+
+# Specify stations:
+az_lwdaily(station_id = c(1, 2))
+az_lwdaily(station_id = c("az01", "az02"))
+
+# Specify dates:
+az_lwdaily(start_date = "2022-09-25")
+az_lwdaily(start_date = "2022-09-25", end_date = "2022-09-26")
+}
+}
+\seealso{
+\code{\link[=az_15min]{az_15min()}}, \code{\link[=az_daily]{az_daily()}}, \code{\link[=az_heat]{az_heat()}}, \code{\link[=az_hourly]{az_hourly()}}, \code{\link[=az_lw15min]{az_lw15min()}}
+}
diff --git a/tests/testthat/test-az_15min.R b/tests/testthat/test-az_15min.R
new file mode 100644
index 0000000..d52f9d5
--- /dev/null
+++ b/tests/testthat/test-az_15min.R
@@ -0,0 +1,101 @@
+library(lubridate)
+skip_if_offline()
+skip_if_not(ping_service())
+skip_on_cran()
+
+test_that("start_date_time works as expected", {
+  res <- suppressWarnings(
+    az_15min(
+      station_id = 1,
+      start_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 02"),
+      end_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 03")
+    )
+  )
+  expect_equal(nrow(res), 4)
+})
+
+test_that("works with station_id as a vector", {
+  res <-
+    suppressWarnings(
+      az_15min(
+        station_id = c(1, 2),
+        start_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 02"),
+        end_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 03")
+      )
+    )
+  expect_s3_class(res, "data.frame")
+  expect_equal(unique(res$meta_station_id), c("az01", "az02"))
+})
+
+test_that("data is in correct format", {
+  res_default <-
+    suppressWarnings(
+      az_15min(
+        start_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 02"),
+        end_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 03")
+      )
+    )
+  expect_type(res_default$meta_station_name, "character")
+  expect_type(res_default$precip_total_mm, "double")
+  expect_s3_class(res_default$datetime, "POSIXct")
+})
+
+test_that("no data is returned as 0x0 tibble", {
+  skip("not sure how to reproduce this now that request for historical data error")
+  res_nodata <-
+    suppressWarnings(
+      az_15min(start_date_time = "1980-01-01 00", end_date_time = "1980-01-02 00")
+    )
+  expect_true(nrow(res_nodata) == 0)
+  expect_s3_class(res_nodata, "tbl_df")
+})
+
+test_that("requests with 23:59:59 work", {
+  h <-
+    suppressWarnings(
+      az_15min(
+        station_id = "az01",
+        start_date_time = paste0(lubridate::today(tzone = "America/Phoenix") - 1, " 23:00"),
+        end_date_time = paste0(lubridate::today(tzone = "America/Phoenix") - 1, " 23:59")
+      )
+    )
+  expect_equal(nrow(h), 4)
+})
+
+test_that("start=NULL, end=NULL works as expected", {
+  expect_message({
+    null_null <-
+      suppressWarnings(
+        az_15min(
+          station_id = "az01"
+        )
+      )
+  }, glue::glue("Querying most recent datetime of 15-minute data ..."))
+  expect_equal(nrow(null_null), 1)
+})
+
+test_that("end=NULL works as expected", {
+  dt_start <- lubridate::now(tzone = "America/Phoenix") - lubridate::minutes(15)
+  end_null <-
+    suppressWarnings(
+      az_15min(
+        station_id = "az02",
+        start_date_time = dt_start
+      )
+    )
+  expect_equal(nrow(end_null), 1)
+})
+
+test_that("start as date only is rounded correctly", {
+  start_input <- lubridate::ymd(lubridate::today(tzone = "America/Phoenix"))
+  end_hour <- paste0(lubridate::today(tzone = "America/Phoenix"), " 01:00:00")
+  start_ymd <-
+    suppressWarnings(
+      az_15min(
+        station_id = "az01",
+        start_date_time = start_input,
+        end_date_time = end_hour
+      )
+    )
+  expect_equal(nrow(start_ymd), 4)
+})
diff --git a/tests/testthat/test-az_hourly.R b/tests/testthat/test-az_hourly.R
index 6cd7544..57a0ab5 100644
--- a/tests/testthat/test-az_hourly.R
+++ b/tests/testthat/test-az_hourly.R
@@ -58,7 +58,7 @@ test_that("start=NULL, end=NULL works as expected", {
       az_hourly(
         station_id = "az01"
       )
-  }, glue::glue("Querying most recent hour of data"))
+  }, glue::glue("Querying most recent hour of data ..."))
 
   expect_equal(nrow(null_null), 1)
   #could be that current hour hasn't hit API yet.
@@ -101,4 +101,3 @@ test_that("start as date only is rounded correctly", {
   )
   expect_equal(min(date_null$date_datetime), start_actual)
 })
-
diff --git a/tests/testthat/test-az_lw15min.R b/tests/testthat/test-az_lw15min.R
new file mode 100644
index 0000000..8c97b7c
--- /dev/null
+++ b/tests/testthat/test-az_lw15min.R
@@ -0,0 +1,101 @@
+library(lubridate)
+skip_if_offline()
+skip_if_not(ping_service())
+skip_on_cran()
+
+test_that("start_date_time works as expected", {
+  res <- suppressWarnings(
+    az_lw15min(
+      station_id = 1,
+      start_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 02"),
+      end_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 03")
+    )
+  )
+  expect_equal(nrow(res), 5)
+})
+
+test_that("works with station_id as a vector", {
+  res <-
+    suppressWarnings(
+      az_lw15min(
+        station_id = c(1, 2),
+        start_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 02"),
+        end_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 03")
+      )
+    )
+  expect_s3_class(res, "data.frame")
+  expect_equal(unique(res$meta_station_id), c("az01", "az02"))
+})
+
+test_that("data is in correct format", {
+  res_default <-
+    suppressWarnings(
+      az_lw15min(
+        start_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 02"),
+        end_date_time = paste0(lubridate::today(tzone = "America/Phoenix"), " 03")
+      )
+    )
+  expect_type(res_default$meta_station_name, "character")
+  expect_type(res_default$temp_wetbulb_meanC, "double")
+  expect_s3_class(res_default$datetime, "POSIXct")
+})
+
+test_that("no data is returned as 0x0 tibble", {
+  skip("not sure how to reproduce this now that request for historical data error")
+  res_nodata <-
+    suppressWarnings(
+      az_lw15min(start_date_time = "1980-01-01 00", end_date_time = "1980-01-02 00")
+    )
+  expect_true(nrow(res_nodata) == 0)
+  expect_s3_class(res_nodata, "tbl_df")
+})
+
+test_that("requests with 23:59:59 work", {
+  h <-
+    suppressWarnings(
+      az_lw15min(
+        station_id = "az02",
+        start_date_time = paste0(lubridate::today(tzone = "America/Phoenix") - 1, " 23:00"),
+        end_date_time = paste0(lubridate::today(tzone = "America/Phoenix") - 1, " 23:59")
+      )
+    )
+  expect_equal(nrow(h), 4)
+})
+
+test_that("start=NULL, end=NULL works as expected", {
+  expect_message({
+    null_null <-
+      suppressWarnings(
+        az_lw15min(
+          station_id = "az02"
+        )
+      )
+  }, glue::glue("Querying most recent datetime of leaf wetness 15-minute data ..."))
+  expect_equal(nrow(null_null), 1)
+})
+
+test_that("end=NULL works as expected", {
+  dt_start <- lubridate::now(tzone = "America/Phoenix") - lubridate::minutes(15)
+  end_null <-
+    suppressWarnings(
+      az_lw15min(
+        station_id = "az02",
+        start_date_time = dt_start
+      )
+    )
+  expect_equal(nrow(end_null), 1)
+})
+
+test_that("start as date only is rounded correctly", {
+  start_input <- lubridate::ymd(lubridate::today(tzone = "America/Phoenix"))
+  end_hour <- paste0(lubridate::today(tzone = "America/Phoenix"), " 01:00:00")
+  start_ymd <-
+    suppressWarnings(
+      az_lw15min(
+        station_id = "az02",
+        start_date_time = start_input,
+        end_date_time = end_hour
+      )
+    )
+  expect_equal(nrow(start_ymd), 4)
+})
diff --git a/tests/testthat/test-az_lwdaily.R b/tests/testthat/test-az_lwdaily.R
new file mode 100644
index 0000000..f069b89
--- /dev/null
+++ b/tests/testthat/test-az_lwdaily.R
@@ -0,0 +1,79 @@
+skip_if_offline()
+skip_if_not(ping_service())
+skip_on_cran()
+
+test_that("numeric station_ids work", {
+  res_station <- az_lwdaily(station_id = 9)
+  expect_s3_class(res_station, "data.frame")
+})
+
+test_that("start_date works as expected", {
+  start <- "2024-07-01"
+  end <- "2024-07-07"
+  expect_message(
+    res_start <- az_lwdaily(station_id = 1, start_date = start, end_date = end),
+    "Querying data from 2024-07-01 through 2024-07-07"
+  )
+  expect_equal(nrow(res_start), 7)
+})
+
+test_that("works with station_id as a vector", {
+  res_2 <- az_lwdaily(station_id = c(1, 2))
+  expect_equal(unique(res_2$meta_station_id), c("az01", "az02"))
+  expect_s3_class(res_2, "data.frame")
+})
+
+test_that("data is in correct format", {
+  res_default <- az_lwdaily()
+  expect_type(res_default$meta_station_name, "character")
+  expect_type(res_default$dwpt_30cm_mean, "double")
+  expect_s3_class(res_default$date, "Date")
+})
+
+test_that("NAs converted correctly", {
+  res_missing <- az_lwdaily(station_id = 1, start_date = "2024-07-01", end_date = "2024-07-01")
+  expect_true(is.na(res_missing$dwpt_30cm_mean))
+  expect_true(is.na(res_missing$lw1_total_wet_mins))
+  expect_true(is.na(res_missing$relative_humidity_30cm_min))
+  expect_true(is.na(res_missing$temp_air_30cm_maxC))
+})
+
+test_that("no data is returned as 0x0 tibble", {
+  skip("Not sure how to reproduce this anymore now that these dates error")
+  res_nodata <-
+    suppressWarnings(
+      az_lwdaily(start_date = "1980-01-01", end_date = "1980-01-02")
+    )
+  expect_true(nrow(res_nodata) == 0)
+  expect_s3_class(res_nodata, "tbl_df")
+})
+
+test_that("warn when some data missing", {
+  expect_warning(
+    az_lwdaily(station_id = "az32", start_date = "2023-07-01", end_date = "2024-07-01")
+  )
+})
+
+test_that("start=NULL, end=NULL works correctly", {
+  null_null <- az_lwdaily(station_id = 2)
+  expect_equal(nrow(null_null), 1)
+})
+
+test_that("end=NULL works correctly", {
+  date_start <- lubridate::today(tzone = "America/Phoenix") - 2
+  last_date <- date_start + 1
+  expect_message(
+    date_null <- az_lwdaily(station_id = "az01", start_date = date_start),
+    glue::glue("Querying data from {date_start} through {last_date} ...")
+  )
+  expect_message(
+    date_null <- az_lwdaily(station_id = "az01", start_date = date_start),
+    glue::glue("Returning data from {date_start}")
+  )
+  expect_equal(date_null$date, seq(date_start, last_date, by = "day"))
+})
+
+test_that("start=NULL works correctly", {
+  last_date <- lubridate::today(tzone = "America/Phoenix") - 1
+  expect_error(az_lwdaily(end = last_date), "If you supply `end_date`, you must also supply `start_date`")
+})