Actually, it is the autumn season that appears to have the fewest hours of sunshine, of all the seasons in the northern hemisphere (unless we count the far north, where midnight sun and noon moon come into play). From the September Equinox to the December Equinox, daylight diminishes, creating the sensation of increasing gloom and darkness. Winter, despite the cold and storms, actually sees increasing hours of sunlight, as the days lengthen progressively from December 21, the shortest day, on. Ironically, as the temperatures reach their coldest, sunlight increases.
I believe that the last night of the year in pagan cultures was October 31, which was appropriated for our Hallowe'en, in North America.
There are some posts of relevance to this discussion on
Estelyn Telcontar's The Symbolic Significance of Weather thread .