Norway and the US aren't directly comparable like that, though. For one, the kilometers traveled per capital for Norway is about half of the kilometers traveled per capita in the US.
It's really hard to say "Norway is cold, Minnesota is cold, they're basically the same place!".
on a general note:
https://en.wikipedia.org/wiki/Hardiness_zone#/media/File:201...
http://www.plantmaps.com/interactive-norway-plant-hardiness-...