rain forms![click to hear](/images/speaker.jpg)
By international convention, precipitation in the form of rain is classified according to the quantity that falls.
heavy rain ![click to hear](/images/speaker.jpg)
Precipitation that results in over 0.3 in accumulation per hour.
moderate rain ![click to hear](/images/speaker.jpg)
Precipitation that results in 0.1 to 0.3 in accumulation per hour.
light rain ![click to hear](/images/speaker.jpg)
Precipitation of water drops over 0.02 in in diameter; it results in accumulations of 0.1 in per hour.
drizzle ![click to hear](/images/speaker.jpg)
Uniform continuous precipitation of slow-falling water droplets between 0.008 and 0.02 in in diameter.