Today was my coldest commute starting @ 16F at 7:00am. Yesterday was a balmy 35F and I was overdressed. Today I was a bit underdressed. But it ended up ok. I stopped halfway through to warm up my fingers. (By sticking them under the balaclava, down my neck.) I rode considerable slower to avoid wind chill. No water needed to be drunk, and very little sweat: maybe I should ridden harder!
The ride home should be above freezing: woot!