18 F with 10-15 mph headwind.

Very enjoyable except for one spot where I got really cold...the quarter-sized patches of exposed skin right behind my ski goggles where the goggles don't quite cover the balaclava face opening. Toes got a bit chilled too despite neoprene shoe covers.

I love the dry, crisp air. Much better than the 30's where it seems like I'm always either chilled or overheated.

The best part of ice bike commuting are the stares of disbelief from drivers.