My coldest complete commute so far at -24 celcius. I turned around after 4 kms a few weeks ago at -27 celcius because my wheel bearing froze. Now with synthetic grease it was fine this morning.

But let me tell you that 27.2 kms at -24 is quite a ride. I needed 1h35 to get to work (2nd worst ever) and I almost fainted when I got to work.
I can't explain why but with the same wind and road condition at a warmer temp. I will get to work in about 1h08 or 1h10 max.
I think I was over dressed. I was very hot when I got to work ( I mean, I'm always pretty hot but this morning was worst )