I think in summer you might find the mosquitoes too annoying to be outside with, and in winter -- you have to keep in mind its not just a shorter day, its also permanently sunrise/sunset on sunny days (depending on your latitude, it could also be just really dark) and mostly slate grey skies anyway so the concept of a "sun room" doesn't really make sense. I quite like Scandinavian winter (I'm in Sweden), but its not for everyone.

It is very beautiful up in Norway though, and the Norwegians are nice people.