What is the unit for measuring precipitation?

Rainfall is usually measured in millimeters.

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Rainfall refers to 12 or the sum of rainfall (snow) in 24 hours. It can also refer to the depth at which liquid or solid (melted) water falls from the sky to the ground without evaporation, infiltration and loss on the horizontal plane. Precipitation is in millimeters, and meteorological observation takes one decimal place, which can directly indicate the magnitude of rainfall.

Rainfall is an important basis for regional water resources calculation, so it is necessary to find an accurate and simple method to predict rainfall.

Rainfall measurement:

Rainfall is usually measured by a rainfall pipe, so it may contain a small amount of dew, frost and frost. Meteorology, there is always precipitation in years, months, days, 12 hours, 6 hours or even 1 hour, and all the rain and snow falling within 6 hours melt into water, which is called 6-hour precipitation; All the rain and snow falling within 24 hours melt into water, which is called 24-hour precipitation; A ten-day rain and snow melt into water, which is called ten-day precipitation. ...

In a year, all the falling rain and snow melt into water, which is called "annual precipitation". Liquid precipitation is called rainfall, and sometimes the two are synonymous. The precipitation per unit time is called precipitation intensity, usually in millimeters per hour or millimeters per minute. The rainfall per unit time is called rainfall intensity.

The average annual rainfall of a place for many years is called the "average annual rainfall" of this place. For example, the average annual rainfall in Beijing is 532.0mm, and that in Shanghai is1166.1mm. ..

Precipitation refers to a weather phenomenon in which liquid water or solid water falls to the ground. Accurate measurement of precipitation is of great significance for weather forecast, climate analysis, monitoring and early warning of natural disasters such as floods, landslides and mudslides.

Related terms:

In the weather forecast, there are clear scientific definitions of "light rain", "moderate rain", "heavy rain" and "heavy rain" and "extremely heavy rain" in meteorology. For example, "sporadic light rain" means that the precipitation time is very short and the precipitation does not exceed 0. 1 mm; "Sometimes there is light rain" means that the weather is gloomy and sometimes there will be short-term precipitation;

"Shower" refers to the sudden start and end of summer precipitation, one big and one small, with heavy rainfall; "Thunderstorm" means a shower accompanied by lightning; "There is rain in some areas" means that precipitation occurs in a small area and its distribution is irregular.