Monsoon Rainfall: Nagaland, Meghalaya show significant decreasing trends in 30 years

However, the monsoon rainfall had been normal at 92 per cent of the Long Period Average (LPA) during June 2022 for the whole country, Union MoS Dr Jitendra Singh said.

ByIFP Bureau

Updated 28 Jul 2022, 6:13 am

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The monsoon rainfall in June 2022 was normal for the country as a whole, but five states - Meghalaya, Nagaland, Uttar Pradesh, Bihar and West Bengal - have shown significant decreasing trends in southwest monsoon rainfall in 30 years period (1989-2018), Union Minister of State Dr Jitendra Singh said on Wednesday.

Based on the IMD report, the annual rainfall over these five states along with the states of Arunachal Pradesh and Himachal Pradesh also show significant decreasing trends, Singh said in a a written reply to a question in the Lok Sabha on Wednesday. He said other states do not show any significant changes in southwest monsoon rainfall during the same period. 

However, the monsoon rainfall had been normal at 92 per cent of the Long Period Average (LPA) during June 2022 for the country as a whole, Singh said.

The LPA of the rainfall for June was 165.4 mm based on the data of 1971-2020.  The rainfall in June is said to be normal if it is within 92% to 108% of LPA, said the Union MoS (Independent Charge) Science and Technology; Minister of State (Independent Charge) Earth Sciences; MoS PMO, Personnel, Public Grievances, Pensions, Atomic Energy and Space.


Singh said the early onset of southwest monsoon is an inherent property observed in the inter-annual variability of monsoon behaviour.

This year, the monsoon onset over Kerala was on May 29 against the normal date of June 1 (3 days ahead of normal date) and it covered the entire country on July 2, 2022, against the normal date of July 8, six days ahead of the normal date for monsoon coverage for the entire country, Singh added.

Acording to the Central data, excess rainfall over East and Northeast India was recorded. East and Northeast India recieved 400.9 mm rainfall from June 1-30, 2022 against the normal rate of 328.4 mm.

The minister also stated that Monsoon remained active in July due to formation and movement of low-pressure systems across Central India and the monsoon trough lying to the south of its normal position. The details of seasonal rainfall for the country as a whole.

From June 1 to July 20, East and Northeast India region recieved 525.7 mm rainfall, while the normal is 610.7 mm.

The Union minister of state further mentioned that IMD has studied and investigated the observed changes of rainfall patterns and its extremes in the recent 30 years in different states and districts and 29 Reports of states and UTs on "Observed Rainfall Variability and Changes” have been published by IMD in January 2020. The reports are also available to the public on the IMD Pune website https://imdpune.gov.in/hydrology/rainfall%20variability%20page/rainfall%20trend.html).


Considering district-wise rainfall, there are many districts in the country, which show significant changes in southwest monsoon and annual rainfall during the recent 30 years period (1989-2018).  With regard to the frequency of heavy rainfall days, significant increasing trend is observed over Saurashtra& Kutch, South-eastern parts of Rajasthan, Northern parts of Tamil Nadu, Northern parts of Andhra Pradesh and adjoining areas of Southwest Odisha, many parts of Chhattisgarh, Southwest Madhya Pradesh, West Bengal, Manipur & Mizoram, Konkan& Goa and Uttarakhand.






First published:27 Jul 2022, 1:29 pm


MeghalayaNagalandweather reportIMD Reportsouthwest monsoon rainfall

IFP Bureau

IFP Bureau

IMPHAL, Manipur


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