La Lluvia engelante o lluvia gélida es un tipo de precipitación que comienza a caer desde las nubes a la superficie en forma de nieve, a grandes alturas, se derrite completamente mientras cae cuando atraviesa una capa de aire sobre la temperatura de congelación (0 °C), y luego encuentra una segunda capa inferior a más bajos niveles de temperatura que la primera, sobrefusionándose. Esta agua entonces se congelará al impactarse en cualquier objeto que encuentre, pudiendo el hielo acumularse hasta varios centímetros, mediante la forma de hielo glaseado.

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Freezing rain is the name given to rain that falls when surface temperatures are below freezing. Unlike a mixture of rain and snow, ice pellets (both of which are sometimes called "sleet"), or hail, freezing rain is made entirely of liquid droplets. The raindrops become supercooled while passing through a sub-freezing layer of air hundreds of meters above the ground, and then freeze upon impact with any surface they encounter. The resulting ice, called glaze, can accumulate to a thickness of several centimeters. The METAR code for freezing rain is FZRA. A storm that produces a significant thickness of glaze ice from freezing rain is often referred to as an ice storm. Although not violent storms, freezing rain is notorious for causing travel problems on roadways, breaking tree limbs, and downing power lines from the weight of accumulating ice. It is also known for being extremely dangerous to aircraft since the ice can effectively 'remould' the shape of the airfoil and flight control surfaces. (See atmospheric icing.)

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