I wanted to emigrate to Sweden due to the high quality of life but the dark, drizzly, windy weather really put me off and some locals I talked to said they were really depressed by it and were either trying to emigrate or work remotely from Southern Europe.
In the Blatics it's probably worse as the economic situational is not positive for some people.
What is the main reason then?
The rest of the seasons are equally important for your well being and coming from southern Austria in April where I was in T-Shirt, shorts and sunglasses to Stockholm & Copenhagen where I had to wear my winter jacket and apply lip balm and hand cream to counteract the skin cracking from the wind was quite a shock.
I love visiting Scandinavia and the Baltics but as a person who enjoys the outdoors all year round, the weather there would be way to depressing for me.
Except the Nordic countries have a lower suicide rates than the US. The whole high rates of suicide in the Nordics is a myth.
Only if you have money. Otherwise there wouldn't be such a mass migration of youths from the Mediterranean moving for work in the Nordics.
A good example is the corruption index published every year, when the US always comes out as one of the least corrupt countries in the world. We all know for a fact there's tons of corruption in this country, we just decided to legalize most of it. Doesn't mean the US can teach anything to any other country about corruption.
But anyway, I'm sure there are great reasons to discount the corruption studies and the studies of quality of life.
I haven't seen any of them in this thread, though.
[1] https://upload.wikimedia.org/wikipedia/commons/f/f8/Europe_s...
https://en.wikipedia.org/wiki/Seasonal_effects_on_suicide_ra...
People tend to say that they get depressed by the winter, but I believe that it is similar to how people tended to say that exercise was bad for you not too long ago. Cold helps against depression in many cases, for example cold showers. If you asked people if they would be happy trading their warm showers for cold showers they would say that it would be horrible even though it likely would improve their overall happiness.
In the fall and winter, you have an excuse to stay in. Everybody else is doing the same, so you're not missing out on much.
Plus part of it is academic. For k-12 and university, you see your 'friends' and 'acquaintances' very often. During the non-academic season, you don't see people as much which can be isolating.
Plus summer and spring, has the expectation of "you're supposed to be happy". So if you're not, then this can be devastating. Winter everybody has this "we're all in this gloomy mood together".
Your single case does not apply to the population at large.