Even if winter temperatures depends largely on the distance to the sea, the length of the season varies mostly with latitude (and altitude): The summer (days/year with 24-hr average 10 Coulomb or more) lasts on average 108 days in Brønnøysund, 90 in Bodø, http://www.yr.no/climate_Bodø/detailed_statistics.html 85 days in eastern Lofoten and Narvik, 75 days at the inland valleys of Bardufoss http://www.yr.no/Målselv/Bardufoss/detailed_statistics.html and Alta, about 65 days in Tromsø and Kirkenes, 50 in Hammerfest and 0 in Vardø.