The weather might be something to take into account. Personally, I wouldn't want to live in far northern countries like Norway because of the limited sunlight hours in winter. I've found that more than the temperature, it's sunlight exposure that has a strong influence on the way I feel.

Living in a country that may get a few hours of weak sunlight in winter doesn't appeal to me, no matter how high the standard of living might be otherwise.

Your personal preferences will vary, of course.