I live in a warm country, in city on coast. I never see snow, I have to travel for hours to see a small amount of it. Oblivion is just too simple for me ... It looks fantastic, but its just ... green ... I really love snow atmosphere, and Bruma is one of my favourite cities, just because of that. It would be awesome if Skyrim had some special cold, winter, snow atmosphere ... All that you mentioned would be very cool.