I always have said that you don't understand the concept of wind chill until you ride your bike in the winter. Sometimes when I have been suffering from PMS (parked motorcycle syndrome) and the roads are clear of ice and salt, I wear something like this:
http://www.motorhelmets.com/htm1/accessories-helmet-accessories-face-mask.htm
It also gets me special attention in convenience stores and airports.

Bob _Budesky aka- rbb