I only ride in the Hayward/Cable area. The last couple years have been not very good riding during that time. We always make a trip up for New Years whether there is snow or not, and it's usually been not.
However, we also have had some of the best riding around that time. The only thing to really watch is if the lakes are frozen. The clubs stake them, so if you stay by the stakes, you should be fine.
REVman