Winter here in the mid-Atlantic region is pretty mild as compared to many areas. I'll ride in temps down to the high 20's as long as there are clear pavement and my driveway is open to the street. Usually sometime after New Years I put the good C&V bikes away and just ride

A) a salty roads bike for in the wild
B) my Moto Mirage on the stationary trainer
C) my c'dale on the rollers.

I don't commute, now don't work at all ( just laid off again - yeah!). I winter ride to keep enjoying it, stay in shape and prevent loss of conditioning.

My salty roads bike has been an old Free Spirit but that's gotta go now and another will take its place.