It varies because snow can be light and fluffy or super heavy and wet. My understanding is where Iβm at - where the snow tends to be light and fluffy, which means a low moisture content - an inch of rain is roughly equal to 10 inches of snow. Three feet of rain would be equivalent to 360 inches of snow, which is a whole winters worth of snowfall (or more) at many ski areas in North America. The Carolina coast is about to get a whole winters worth of moisture in the Rocky Mountains in just a few days. Itβs gonna suck.