noglider 

I commute by bike almost every day. My alternative mode is not a car but the subway. A fixed gear bike is nice for winter, as it keeps you warm, gives you extra conditioning, and it gives you a faster workout. I commuted on a fixie exclusively one winter long ago. And even though the weather can be bad, my outlook is that a bad day on the bike is better than a day off the bike. That's what I tell myself so I'll head out the door with the bike. I never regret riding, but I often regret not riding.