It seems, according to this article, that there is more effects tied to living in a Northern climate than Seasonal Affective Disorder. Apparently there is a correlation between the lack of Vitamin D that you get from a normal amount of sunlight and cancer. Oddly enough, there is still a correlation between getting too much sun and getting cancer, so pretty much you're damned if you do, damned if you don't. Me, I'll take my Northern climate and a bottle of Vitamin D to go please.
Toronto Globe and Mail via Anchorage Daily News