The Somerville Parking Permits are notoriously hard to remove. And, yes, the cold makes it even harder. I usually use a razor blade and it works pretty well. If you're parked near your house where you can run an extension, a blow dryer will take it right off completely! Bumper stickers, too, by the way. I've even removed bumper stickers from one car this way andplaced them on my new(er) car - good as new!