Sorry I have to disagree. Winter rocks.
Less traffic in the bike lane. Plus whoever you see outside you know they can't be that much of a loser, they are riding their bike on a 30 degree day. Plus you never have to worry about clothes, whatever you are wearing you will still be cold.
Plus, how many times this year have you said "38 degrees?!?!? BALMY! I have to ride!" Get outside man! it's 45 degrees in chicago!