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Some Facts About Monsoon & It’s Rainfall in Mumbai

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Monsoon is set late over Mumbai on 25th June 2023 by IMD. After 1959 this is 3rd occasion just after the year 2019 that monsoon is set late over Mumbai and surroundings. Last year iin 2022 it was set on 11th June 2022. . 

Being the coastal city and due ro Sahyadri mountains, Mumbai receives good amount of rainfall over 2000 mm durng monsoon as compared to 500mm over other places in interior Maharashtra.

Here are some facts about rainfall during the period of June to September.

The normal date of monsoon over Mumbai was 10th June, but the dates had been fluctuating. In some years the monsoon was delayed considerably while in some years it had been very early.

Here are some statistics for onset dates over Mumbai:
1) Early onset – 29th May in the year 1952, 1956, 1872
2) Late onset  – 25th June in 1959, 2019, 2023

Monsoon onset dates since 2010:

Year

Onset Date

2010

14th June

2011

5th June

2012

17th June

2013

7th June

2014

15th June

2015

12th June

2016

20th June

2017

12th June

2018

9th June

2019

25th June

2020

14th June

2021

9th June

2022

11th June

Below is the chart of monsoon dates over Mumbai for last 67 years. (Data source: IMD)

(Click the image to see enlarge image)

The average seasonal rain that is rainfall from June to September is:

1) Santacruz is 2265 mm.

2) Colaba is 2025 mm.

The extreme rainfall events in Mumbai:

Colaba

10 June 1991

478 mm

5 July 1974

576 mm

3 Aug 1881

287 mm

10 Sept 1930

548 mm

Santacruz 10 June 1991

399 mm

27 July 2005

944 mm

23 Aug 1997

346 mm

23 Set 1981

318 mm

For detailed rainfall statistics over Mumbai visit: IMD Mumbai website

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