Ooh, I have a new cold record! And a new handy tip!

My last "lowest" was around -15 C (5 F), but I remember it as a bit painful. Now I rode in to work (50 minutes) one morning in -16,5 C (2-3F), had a couple of cold fingertips on the downhill part, they thawed up nicely but then my toes started complaining, so when I got to work I had 3 or 4 really cold toes.

Next morning was -19 C, I wussed out.

Next morning was -16,5 C again, and I was determined to try again. Fashioned toe covers out of newspaper - one double sheet folded once, placed with the fold right in front of the cleat underneath my shoe, then just packed around my forefoot like packing a gift, and one round of tape around to hold it together. Then shoe covers over. Toasty warm, worked like a charm! And they were solid enough that they can be reused, even!