Who knows how to calculate the rainfall in the weather forecast?

Calculated by the total accumulated rainfall for 24 hours, and the calculation unit is millimeters.

Light rain means that within 24 hours, the precipitation does not exceed 10mm, with small to moderate rain of 5 ~16.9mm, moderate rain10 ~ 24.9mm, moderate to heavy rain17 ~ 37.9mm, heavy rain of 25 ~ 49.9mm and heavy rain of 38 ~ 74.9mm..