On average, snow weighs between 7 pounds per cubic foot and 20 pounds per cubic foot, according to North Dakota State University. The discrepancies can be attributed to the physical state of the ice, its depth and the atmospheric temperature; fluffy snow is light, while compacted snow is heavier.
According to Atmos News, while the weight of piling snow compresses it so that it weighs more per cubic foot, if the temperature is at melting point or higher, some of the snow is actively melting as more snow falls, so its density is constantly changing. Atmos News concludes that the state of snow in every snowfall is different. However, 10 inches of snow is estimated to be equal in weight to 1 inch of water.