I'm in Southern Maryland(WAshington DC area). So it's about the same as it is up there. We dread this time of year, for walks anyway. I just make sure they have coats on and unfortunately, the walks are more and more shorter as winter approaches. I hate to see them shiver too long. We usually take 30 min walks & play in open fields about 3 to 4 times a day...that will be drastically cut down...and the playing part of it will be indoors.
If you dont' take them out as long, just make sure they get enough exercise with some indoor activities.