No harm in trying out the USA in the cold as well. I was in Chicago area a couple of years ago in the winter, in the snow, and it was great. Real proper snow, not like the crap we get here from time to time. Well worth the experience. Don't worry about getting around, the roads are kept well maintained and clear all the time (they are used to it).
I would say the Rockies in the west are spectacular in the winter.
All you have to worry about is wrapping up warm!!