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snow is Snowflakes that are clusters of ice crystals that fall from a cloud. Snow pellets, or graupel, are opaque ice particles in the atmosphere. They form as ice crystals fall through supercooled cloud droplets, which are below freezing but remain a liquid.

Snow forms when the atmospheric temperature is at or below freezing (0 degrees Celsius or 32 degrees Fahrenheit) and there is a minimum amount of moisture in the air.