It's unusual for Ottawa to have decent riding weather in December, but this past weekend I managed to get out in sunny, 7 deg. C. weather on both Saturday and Sunday for very enjoyable, short morning rides. Saw one other motorcyclist.
I'll still ride on and off all winter. As long as there is no ice / snow on the roads and the temp is 15 - 20F I'll still commute on the bike. 30 minutes each way isn't bad.