Winter training can be fun and it definitely forces you to work on your balance, but for the most part it's dangerous.
If you're in a relatively clear area there's nothing wrong with facing the elements, but just be wary of the slippery surfaces,
always check your landings you never know what they'll be like. A lot of people view winter as a time to train for parkour,
rather than just parkour itself, now's a great time to hit the gyms, both gymnastic gyms and weight rooms, getting up your strength,
your endurance, and flexability. All these things will really help when spring comes around.