As usual on these threads about suggestions to keep warm during winter cycling, I request that the posters provide not only the temperatures but also the distance of their rides for comparison purposes. My own particular definition of a cold ride, gleaned from BF, is when my water bottle freezes solid; a function of both temperature and distance (time). I carry a water bottle in winter mainly for that purpose, and I showed it off to people at work this morning.

Today at 6:00 AM I left downtown Boston at 15 degrees F with an 18 mph approximate tailwind for my 14 mile commute, and arrived at my suburban destination at 3 degrees and calm. My feet only at first felt perceptibly, though tolerably cold at mile 12, and did not trouble me at the end. I wore thin woolen socks, thick woolen socks, clipless leather cycling shoes and heavy ply Neoprene booties with a wide open holes on the soles for the cleats. The soles did not come pre-cut, and the holes I cut were larger than necessary, and have torn open even wider over the past few years. I bought them however, because they were so thick, thicker than other Neoprene booties I have seen on the market.