From Andy Coupland:

I thought you might like this:

 It seems to support one of the comments from data-nerd Canadianveggie: “Rain and snow are obvious deterrents to cycling, but extreme cold apparently isn’t. On days where the temperature dropped below freezing, but were dry, cycling volumes were on par with days averaging +5 C.”
So it’s minus eight (and less with the windchill) and as I crossed the street there were six cyclists on the bike lane. It was way too cold to hang around to select the greatest volume of cyclists; it was a genuine snapshot in time!