The following link is to a Strib article from
last year with recommendations on how to bike year-around, through the
snow and sub-zero temp.
snow_biking.jpg (382k download 1000x2192 pixels)
No authorization given for carrying this story.
But hopefully it will be useful nonetheless.
I found the recommendation on reducing the air pressure in the tires to
be very interesting. After spinning my wheels -- with nobby tires --
last winter and giving up, I'll give this one a try when it becomes
necessary and give feedback on how well it works.