Many people have entirely wrong preconceptions about the weather in the nordic countries.
It can get far warmer than one would probably expect at those degrees of latitude. In Norway the Gulf Stream bring warm seawater to the coast. Even during winte its harbouirs remain free of ice. However, because of mountains etc the midnight sun cannot always be seen. This phenomenon occurs at a height of 100km and takes tho form of a curtain fluttering in the wind, or points of light emitting from a single spot.