Around here, this is the best time of year. It's crisp in the morning so you don't get all hot and sweaty on the way in. It's fun riding with lights, at least until the novelty wears off. Even snow is fun the first few times. For me, the hardest point is at the end of the winter when there's no novelty, just cold, wet and dark.

On the difficult days, I tell myself that if I let myself back out today I'll always find a reason not to bike, then I won't be a regular biker anymore, and I'll lose all the benefits. I also have a consecutive bike-to-work-day streak -- currently over 500 -- that I'm trying to maintain. Basically, it's the same motivational tricks as AA.