I've commuted in negative temps lots of times. -22 or -23 °F was the coldest. Don't remember which it was.
After yesterday I can confidently state that none of that compares to the pain of spending 3 hours in -6 degree weather watching a football game only to have the kicker miss a damn chip shot to knock your team out of the playoffs.
Actually the first 59 minutes and 36 seconds were very enjoyable. Commuting in that kind of weather taught me how to dress. Though standing still is a much different endeavor than riding.