Norway is a long mountainous country with lots of fjords and islands. You find the Arctic Circle south of Bodø, about half way up, and Oslo is at 60 degrees north, which is the same as Anchorage in Alaska. Dispite this the temperatures are fairly mild because of the Gulf Stream flowing along the coast. In costal areas the minimum temperatures in winter are just below freezing, but inlands the temperatures may drop to minus 30 deg.C on really cold days.
In Oslo where I live the average temperature in winter is just below freezing, and in the summer we have around 20 deg.C (+/- 10 deg.)