Rain ClassPrecipitation Intensity
light drizzle<0.5 mm/h
strong drizzle0.5 - 1 mm/h
slight rain1 - 2 mm/h
moderate rain2 - 5 mm/h
strong rain5 - 12.5 mm/h
heavy rain12.5 - 25 mm/h
very heavy rain> 25 mm/h