Well, I spent some years living in Alaska during my 20's, and even up in Barrow (a town on the state's north coast), the ice recedes and it can get relatively comfortable in the summer (cuz the sun stays out all the time). In the more southerly regions of the state - particularly in the interior - it can climb to over 38C during mid-summer.

Given that we haven't been hearing about the sun staying up (or down) at all hours, we're either not that far north, or the world of POTN just doesn't follow the rules of physics that closely. Or it's spring or fall, at which times the day/night cycle works more or less normally.