I got in a slow, long (1hr 45min) ride today. The weather was windy and overcast, with temps just above freezing. I like riding during the afternoon, because there's less traffic to fight.
Got a heart rate monitor a couple weeks ago. I tend to push a little too hard. On my first ride, I hit a max heart rate of 185, and I wasn't really pushing hard. I usually feel spent after hard rides, though. On my ride today, I burned over 1500 calories.
My favorite part about riding in cold weather is the shower afterwards. It feels so good to go from freezing temps to a steaming hot shower. That, with the slight runner's high is absolutely marvelous. Getting to sleep at night after a good ride... well, piece of cake.
jurgen