23F at 6AM: thick frost on my deck, lawn & driveway, I decided to drive in. Good decision as it was pretty icy in spots. I fell & bent the crank arm on my Centurion a week ago Monday & didn't want to repeat. (Bill at the LBS had a special tool that straightened my crank arm). It was really balmy by lunchtime & I was able to make one circuit to work & back in the afternoon. 63F is nice while it lasts. Don