Living in New England we get snow, sometimes a little and sometimes a lot. Our training day does not change, we still walk the dogs, still work the dogs and still the dogs play outside. If you live in NE you cannot have the excuse about winter not working your dog, because between snow and rain, too cold, too hot, well you may have only 5 days of perfect weather a year. For us, every day is a perfect training day, the dogs feel the same way. They do not care, they just want to keep there mind and body busy.
Keep in my that if your dog ran away from home, it would most likely spend all day outside, running, walking, jumping, searching, hiding in the weather..so I think you can plan that type of life for your dog if you want