Winter precipitation is a term used to describe the type of precipitation that falls during the winter season. SNOW, SLEET, and ice rain are all forms of winter precipitation. SNOW is frozen precipitation that falls from the sky in the form of white flakes. SLEET is a type of precipitation that is made up of small ice pellets that fall from the sky. Ice rain is a type of freezing rain that is composed of supercooled water droplets that freeze upon contact with objects on the ground.