That stuff is the BEST to ride on. Last year when we got 22+" of snow in early dec in boston, I rode along all week with 27X 1-1/4" tires. SO FUN! The best part is that you can sort of powerslide around turns/ corners/etc, with not much effort. In fact you can just throw your weight into the turn, and use your legs to pull on the cranks, and you slide/skid into the turns. Just don't use your front brake.
You can't go as fast, but riding in snow is fun! Riding into 6' snowbanks @ 15mph is really fun.
Plus there's usually not many cars on the road.