In which city, how much rain in the monsoon, how does the Meteorological Department measure?

As soon as the monsoon season arrives, people’s eyes are on the report of the Meteorological Department on the rain all over the country. Today, news like 20 mm of rain in Delhi, 100 mm rainfall record in Mumbai, or less than normal rainfall in Kolkata becomes common. But have you ever thought that how does the Meteorological Department decide how much rain occurred in which city? And what does this mean?

Rain is measured in millimeters (mm). When the Meteorological Department says that Delhi receives 20 mm of rain, it means that if you place a container on a flat surface, then 20 millimeters i.e. 2 cm of water will accumulate in it, provided it does not shed water or does not contain the ground.

How does the Meteorological Department measure rain?

The Indian Meteorological Department does the work of measuring rain in India – India Meteorological Department. For this, a device called Rengez is used. This device is a cylindrical container in which rain water collects. The more water it collects, the more rain is considered. The amount of rainfall is measured in millimeters (mm). For example, if it is said that a city has received 10 mm of rain, then it means that water accumulated up to 10 mm height in a square meter area.

Renge’s network spread across the country

The IMD has a network spread across the country, which includes thousands of Rengez stations. These stations are installed in every state and every big city which record data continuously. Apart from this, the Meteorological Department prepares accurate prediction and report with the help of satellite, doppler radar and computer models.

How many rain in which city?

In the beginning of the monsoon season 2025, many parts of the country have been recorded more than average and less rainfall. For example, in Mumbai, in June, about 1200 mm of rain has been recorded so far, which is slightly higher than normal. Delhi received about 200 mm of rain, which remained close to the normal level. The monsoon started slow in Kolkata but till the beginning of July, more than 500 mm of rain has been received.

How is the monsoon report released?

IMD releases reports like Daily Rainfall Report, Weekly Weather Summary and Monsoon Update every day. This information is delivered to the public through the website of the Meteorological Department, mobile app and news agencies.

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