Saskatoon sees lots of winter commuting, too... wet is way worse than cold, and we're too cold to be wet. I had -31C this morning, so I got out my winter coat and helmet... too warm! I was sweating. -41 is my personal best, although the headset bearings were getting dangerously stiff at that temp. New grease this year, where possible.

By the way, when talking temperature, do you consider windchill or not? I don't; windchill only matters for people standing still... when you're on a bike, the windchill is a pretty consistent effect, so I find the 'real' temperature to be a more reliable guide than the 'windchill' temperature.

There were 3 other cyclists that made it in to work before I did. Down from our typical summer numbers of about 15, but that's still a pretty good ratio of die-hard to fair-weather cyclists!