For some reason, I got the bright idea to start commuting by bike in the midst of winter last year. Incidentally, riding the 8 miles to work that day was the first time I had ridden my bike more than 2 miles, and it was only 25F. I got a few single digits last year, and I've had two this year (I'm counting 9.8F single digits... Both days were the same according to both my thermometers). My rear brake cable was frozen on Tuesday, took some hard pulling on the lever to get it to work. It was kind of weird.