Cold doesn't bother me.....much at all really, but I run about 10F hotter than most people it seems like .

Rain + cold does suck though, I can't argue with that.

Actually, I love when the trail clears out in November around DC. That's one of the benefits of winter cycling. I see some of the same people out in the winter mornings....so some folks do it, but not nearly as many as this time of year.