I know I'm going to jinx myself, but I've lived in the Philly area for over 20 years now and before the past two winters, during most years I've played almost year round, with south Jersey (remember that Crump built Pine Valley partly as a place to get away for winter golf and the Atlantic City Country Club before then was the winter Mecca for Philadelphians looking for a winter round) and Maryland the sites of most of my "winter tours". I've also spent a fair amount of my winter time in and around NYC, and there are quite a number of year-round sites there, as well.
However, even further north in the Philly burbs, many courses are open year-round, as long as there is no snow on the ground. I've had many enjoyable winter rounds, where one can play quickly and enjoy a brisk, 40-50 degree day on foot.
It beats the hell out of a day spent in front of the TV watching the NFL.