Freezing rain is caused when you have a warm mass of air in the middle altitudes between the ground and the cloud deck, followed by a mass of freezing air near the surface. When the precipitation falls from the cloud, it will start as snow. As it encounters the warm air, it will melt into the usual rain. But right before it reaches the ground, it enters the area of below-freezing air and cools to right around freezing -- or perhaps just below, a process called "supercooling."
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