A snowstorm is forecast for this coming weekend, and for worms and other creatures that live below ground, that's a good thing. While our worms are in warm bins during the cold weather, so they can continue producing quality vermicompost, there are the "wild worms" and other invertebrates that live out in the soil and simply look to outlast the winter.
It's easier for them to survive if there is a "blanket of snow" in that snow acts like an insulator against the extreme cold we can get in northern New York. If you have a winter with a good snowpack, the frostline won't generally penetrate as deeply as it would with bare ground.
A solid snowpack does provide a blanket for our friends living beneath the surface.