Merge pull request #1290 from PyPSA/annual-temperature-reduction #1

Job	Run time
OS (macos)	12m 42s
Inhouse (pypsa)	12m 49s
OS (windows)	20m 47s
Inhouse (atlite)	15m 57s
OS (ubuntu)	12m 33s
Inhouse (powerplantmatching)	7s
Inhouse (linopy)	13m 15s
	1h 28m 10s

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