Well, it was 12 degrees F today on my ride to school, just popped on my snowboarding gloves and "turtle fur" neckwarmer, I had a couple of hats on and I was decently warm. Made the ride in about an hour (18.4 miles with a 1 mile uphill).
Doing it again until thursday, to and from school. I'm not letting the cold keep me in, though the snow seems to scare me away usually.