Snowfall forecasts are not explicitly issued by the Climate Prediction Center as the forecasts for temperature and precipitation are. However, you can surmize a snowfall forecast, at least approximately, from the temperature and precipitation forecasts. For example, above average snowfall can be inferred from the combination of a tilt of the odds toward below normal temperature and simultaneously toward above normal precipitation, such as in the Great Lakes region and the northern Rockies. But I say "approximately" because it is not quite that straightforward. It is possible that during the Dec-Feb season, episodes of below normal temperature may not coincide with episodes of above normal precipitation. In other words, the sub-seasonal timing may not be conducive to combining low temperatures with high precipitation. Therefore the surmized snowfall forecast based on seasonal temperature and precipitation forecasts must be accompanied with this caveat, and some consequent uncertainty.