I’m Swiss, but I was born and raised in the Gulf states. When I visit Switzerland during the cold season, I immediately become depressed, irritable, and in a bad mood. I prefer the heat 100%. I don’t think I could live in a place with a cold climate and be happy.
That was my first thought too. My understanding is that Nordic countries do think about vitamin D deficiency (especially this time of year) so it’s common to see stuff like cod liver oil and other ways to supplement vitamin D. Figured Switzerland would be similar.