This official Norwegian site has great information about Norway's climate and explains exactly what effects it.

--quote--
Given Norway’s extreme northerly position, its mainland climate is surprisingly mild.

Norway is the northernmost country in the world to have open waters. This is due to the trade winds forced across the Atlantic Ocean by the American continent and the warm currents flowing north from the Equator towards the Norwegian Sea, where the angle of the Norwegian coastline and an open path to the Arctic Ocean help to guide the temperate air and waters to a more northerly latitude.
--/quote--

And here is a great image of average rainfall and temp.

http://www.flickr.com/photos/33749589@N07/3530583894/
Source(s):
http://www.studentsoftheworld.info/pageinfo_pays.php3?Pays=NOR&Opt=clim...
http://www.norway.org.uk/facts/climate/climate/climate.htm


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