We've had the longest sustained cold spell in years since the beginning of January, but oddly have not broken any low-temperature records. However, I have tied my previous coldest commute 3 times in the past 5 days of commuting with morning lows of 17, 17, 18, 19 and 17 F. I knew it was cold this morning when my water bottle froze so much that I couldn't get a drink. I'm getting used to riding in the cold, though. Went on a 40-mile group ride yesterday where the temps ranged from about 27-32 F, and it felt positively balmy.