Drizzle
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Image of drizzle in a mountain valley. Image is in the public domain.
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Drizzle is light rain. Drizzle raindrops are extremely small. They are smaller than half a millimeter in diameter—the size of the tip of a needle. Drops this small don't really even fall to the ground. Instead, they float. They get blown around by the wind. Sometimes they group together and this makes them heavy. In this case, they do fall to the ground. But they don't stay there for long. They evaporate back into the air before they have time to form puddles.

National Weather Service Observing Handbook No. 8, Aviation Weather Observations for Supplementary Aviation Weather Reporting Stations (SAWRS), Manual Observations, November 2015
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