When Winter time comes around, I usually end up some-what hibernating and don't really leave the house. As of lately I can't though because my shoulder hasn't healed completely yet from when I partially tore my rotators cuff.
The amount of time I spend working out in winter doesn't change, but the types of workouts I get in are quite different. In the summer it's all about being outside, playing games, and having fun. I get most of my summer exercise in by doing things like running around and playing football or battling it out in water balloon fights. In winter I have to stay inside to workout, so I do more traditional things, like pilates, cardio kickboxing, etc.