The relatively warm Gulf current flows along the islands, meeting colder air from the north. This meeting gives great room for variation.
Low pressures coming in from the Atlantic ocean make some winters a stormy experience.
Other years a vast high pressure in the east keeps the storms away from the coast. Wind from southwest brings rain, if it turns northwest then we get snow. At 69 degrees north the sun never rises above the horizon from late November to late January. We're used to this. I've picked twelve slides which will give you an impression of what our winters may look like.