Hmm, I'd be hard put to give you any good stories that a book on norse mythology wouldn't give you. But I'll bet the Sami people have some interesting myths, they are the native people of Scandinavia.
But we most certainly have seasons, and very distinct ones. I live near the Gulf Stream and far south in Norway, so winters aren't by far as harsh as some of you might imagine, but further inland they have truly brutal winter cold. Likewise the inland areas can have very hot summers, they just don't last very long. Oslo has snaps of hot weather (which we define as around 30 deg C) but they last at most for two weeks at a time. We have lots and lots of water, though. Not really that it rains that much, but when I travel abroad it always strikes me how dry so many other places are. The landscape here just about never runs out of water, so vegetation is soft, not spiky, and almost always green. We get loads of snow in winter, and it can last until May.
That was a digression. Only myth I can think of connected to the weather at the moment is "kakelinna", the "cake mildness". (Mild weather here means temperate winter weather, like just below or around freezing). Kakelinna denotes the mild, foggy weather we often get between Christmas and New Year's, and supposed to be caused by all the housewives baking the traditional 7 types of Christmas cookies.
We have a gazillion words for snow, though.
Winter riding is much less about badassery and much more about bundle-uppery. - malkin
1995 Kona Cinder Cone commuterFrankenbike/Selle Italia SLR Lady Gel Flow
2008 white Nakamura Summit Custom mtb/Terry Falcon X
2000 Schwinn Fastback Comp road bike/Specialized Jett