June 3, 2021

The India Meteorological Department (IMD) said that monsoon rains in the month of June-September would be 101% of the Long Period Average (LPA) of 88 cm. Earlier, on April 16, it said the rain would be 98% of the LPA. In the agency’s parlance, this still constitutes ‘normal’ rainfall, which is anywhere from 96-104% of the LPA.


  • Long Period Average (LPA) is the averages of rainfall received over a 50-year period between 1951 and 2001. This average comes to 89 cm of rainfall.

  • This is the average rainfall recorded during the months from June to September, calculated during the 50-year period, and is kept as a benchmark while forecasting the quantitative rainfall for the monsoon season every year. 

Categories: IMD maintains five rainfall distribution categories on an all-India scale which are –

  • Excess: If the rainfall is more than 110 % of this LPA.

  • Above Normal: If the rainfall is between 104 and 110 % of this LPA.

  • Normal: If the rainfall is between 96 and 104 % of this LPA.

  • Below Normal: If the rainfall is between 90 and 96 % of this LPA.

  • Deficient: If the rainfall is less than 90 % of this LPA.

Source : The Hindu