I don't know, while I am enjoying the recent December riding, with temperatures in the high 40's/50's, there are plenty of other outdoor pursuits to do in the cold/snow. The key to winter is to be outside. I am bummed that there is no snow anywhere, locally, and it's even fading up north. No snow=no nordic skiing. There is one nordic center that still has very good conditions, and I am contemplating going up there (northern NH) on New Year's Day, for the weekend. The season here, for x country skiing is short, at least for me, because I start riding outside on a regular basis in March, while many wait until April. My guess, is that I lf I lived in a place where I could ride year round, I would get burned out. In fact, I know that would happen, as I have to be careful of that even now.
My club has either a ride or hike on Wednesday. The temperature is going to be 24 when the ride leaves. Going to *try* to challenge myself to do this, but I have my doubts!