It's only supposed to get down to -5*F here. I've ridden down to -25*F. I'm not riding today or tomorrow though due to the heavy snow that hasn't been plowed yet. The ruts mean that I can't be sure that I'll be able to hold a line, and since I ride on 60 MPH roads with no shoulder, it's just not safe. I've had ruts throw me half a lane over without warning, so I've decided to drive for a couple of days after heavy snow until things get plowed down.
The temps don't stop me though. I did just fabricate some electric toe warmers that I hooked up to a Magicshine battery pack and tried it out at -7*F a couple of weeks ago, it worked fine.
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Work: the 8 hours that separates bike rides.