I have been told that chickens love the snow. I know they love ther rain, they are crazy about the rain. I too would worry about the wet feathers in a cold coop at night. But, I really do not know what is right or wrong here. Personally, I would keep them in the coop if they are free ranging. But, i really do pamper my birds. It is almost to the point of being dumb. Trust me, my chickens really do like me. They like the bread, the scratch, the water......