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Data from Meteoswiss is not free. A bit weird in my opinion, since it is already payed for with tax money right? The Dutch weather service does provide a very nice API, where you can pull historical data from. I did the analyses with their data and it was/is very sunny over there.
You have some data on https://map.geo.admin.ch/ regarding the weather / sun time / pollen / etc. but I'm not sure you can access much historical data. But Most likely they have it somewhere as an API...there is also https://www.geocat.ch/ which can help find data on geo.admin.ch.