Cold is no bother, as long as I'm not at home. If I'm at home and it's cold, I go nuts, because I can't relax. If I'm not at home, I'm not relaxing anyway, so it doesn't matter - helps to keep me active.
Heat, on the other hand, just sucks the life right out of me no matter where I am. I hate summer worst of all, and tend to look forward to winter (especially because, winter is also much much quieter if you live in the city)