You're kind of young to do any "real" job, you could shovel snow clearing neighbors walks and driveways. You could also walk dogs, some people don't feel like walking their dogs in the winter. You could do chores and odd jobs around the house or for other people. You could also set up a coffee stand (like a lemonade stand in the summer) and sell quality coffee to early morning commuters and people out for a walk and also for people walking their dogs. Considering the above ideas, if you come up with a better idea by yourself, remember these are only suggestions.
Please do not attempt any extreme stunts for quick winter cash, horrendous pain and suffering may ensue.