I only have 1 tip:

Plan for being out in the snow for an hour or so on foot. You may be layered plenty for RIDING in the winter, but get a flat or suffer a mechanical problem and you can get real cold, real fast standing or walking around.

I know, it is extra weight/ bulk to bring the extra clothing you would want if you were walking, or waiting for a ride at a bus stop or something, but it is worth it rather than freezing in the snow fixing a flat, or waiting for a bus.