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rain forms ![click to hear : rain forms click to hear : rain forms](../../../images/speaker-vert.gif)
By international convention, precipitation in the form of rain is classified according to the quantity that falls.
heavy rain ![click to hear : heavy rain click to hear : heavy rain](../../../images/speaker-vert.gif)
Precipitation that results in over 7.6 mm accumulation per hour.
moderate rain ![click to hear : moderate rain click to hear : moderate rain](../../../images/speaker-vert.gif)
Precipitation that results in 2.5 to 7.6 mm accumulation per hour.
light rain ![click to hear : light rain click to hear : light rain](../../../images/speaker-vert.gif)
Precipitation of water drops over 0.5 mm in diameter; it results in accumulations of 2.5 mm per hour.
drizzle ![click to hear : drizzle click to hear : drizzle](../../../images/speaker-vert.gif)
Uniform continuous precipitation of slow-falling water droplets between 0.2 and 0.5 mm in diameter.