This morning's 21F was one of the coldest I've ridden in. It just doesn't get below 20 very often. I was pretty good until about 40 minutes into the ride. My fingers and toes were the only parts that got cold, and not even those were too bad.
There are still spots of icy snow on the road, but all of them had dry tire tracks through so I felt safe riding. The week warms up as we go, so the riding will just get easier.