Monsoon · Rainfall

High Rainfall days in India’s districts in August 2021

An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for the month of Aug 2021, 3rd month of India’s South West Monsoon 2021 shows that there were 431 instances when district rainfall of a day was above 50 mm. The normal monthly rainfall of India Aug is 258.2 mm and actual rainfall was a huge 24.13% below normal at 195.9 mm[i], the actual average daily rainfall in this month was about 6.45 mm. Such high rainfall instances included 371 instances when rainfall was 50-100 mm, 48 instances when it was 100-150 mm, 11 times it was 150-200 mm and just once above 200 mm. Interestingly, in June 2021[ii] and July 2021[iii] there were seven instances when rainfall was above 200 mm, when the rainfall is supposed to be much below July rainfall. As noted in detailed article[iv], the July 2021 rainfall all over India was 6.7% below normal.

The lone instance in Aug 2021 when rainfall in a district crossed 200 mm was in Shivpuri district of West Madhya Pradesh, where on Aug 3, the rainfall was unbelievable 312.8 mm.  

Out of 694 districts of India, 216 districts or about 31.3 of the districts experienced such high rainfall in August 2021, many districts that had more than one such high rainfall days. The highest number of such instances were seen (in June and July 2021 Konkan had the highest number of such instances, 48 & 56 respectively) in Meghalaya, where for the seven districts there were 41 instances when rainfall was above 50 mm. Arunachal Pradesh was close second with 39 instances involving 7 of Arunachal’s’s 16 districts. Incidentally, Assam had 46 such instances in June 2021 and 31 in July 2021 and now only 26 in August 2021.

Among the five regions of India (North, South, East, West and North East), North East India had the highest number of such instances (135), followed by East India (121) and West India (104). North India had the least such instances at 22.

North East India In the table below are given the number of such high rainfall district days in each of the states in North East India in each of the rainfall categories in August 2021.

StateDistricts that had over 50 mm rainfall at least on one day in Aug 2021 (Total no of districts)No of district days when rainfall 50-100 mmNo of district days when Rainfall 100-150 mmNo of district days when Rainfall 150-200No of district days when Rainfall over 200 mmTotal no of district days when rainfall over 50 mm
Arunachal Pradesh7 (16)3441039
Assam13 (27)2600026
Meghalaya6 (7)24125041
Nagaland3 (11)31004
Manipur4 (9)72009
Mizoram5 (8)81009
Tripura4 (4)40004
Sikkim2 (4)30003
North East India44 (86)1092060135

East India

StateDistricts that had over 50 mm rainfall at least on one day in Aug 2021 (Total no of districts)No of district days when rainfall 50-100 mmNo of district days when Rainfall 100-150 mmNo of district days when Rainfall 150-200No of district days when Rainfall over 200 mmTotal no of district days when rainfall over 50 mm
W Bengal12 (19)2720029
Odisha2 (30)30003
Jharkhand8 (24)820010
Bihar16 (38)2510026
Uttar Pradesh39 (74)4760053
East India79 (185)1101100121

North India

State/ Union TerritoryDistricts that had over 50 mm rainfall at least on one day in Aug 2021 (Total no of districts)No of district days when rainfall 50-100 mmNo of district days when Rainfall 100-150 mmNo of district days when Rainfall 150-200No of district days when Rainfall over 200 mmTotal no of district days when rainfall over 50 mm
Uttarakhand4 (13)80109
Haryana2 (22)20002
Chandigarh0 (1)00000
Delhi6 (9)52007
Punjab0 (22)00000
Himachal Pradesh2 (12)20002
Jammu & Kashmir2 (20)20002
Ladakh0 (2)00000
North India16 (101)1921022

West India

StateDistricts that had over 50 mm rainfall at least on one day in Aug 2021 (Total no of districts)No of district days when rainfall 50-100 mmNo of district days when Rainfall 100-150 mmNo of district days when Rainfall 150-200No of district days when Rainfall over 200 mmTotal no of district days when rainfall over 50 mm
Rajasthan14 (33)2960035
Madhya Pradesh22 (51)2882139
Diu Daman1 (2)11204
Gujarat4 (34)70007
Dadra Nagarhaveli1 (1)20002
Goa0 (2)00000
Maharashtra9 (36)1000010
Chhattisgarh5 (27)70007
West India56 (186)841541104

South India

StateDistricts that had over 50 mm rainfall at least on one day in Aug 2021 (Total no of districts)No of district days when rainfall 50-100 mmNo of district days when Rainfall 100-150 mmNo of district days when Rainfall 150-200No of district days when Rainfall over 200 mmTotal no of district days when rainfall over 50 mm
Andhra Pradesh0 (13)00000
Telangana8 (33)90009
Tamil Nadu1 (38)10001
Puducherry3 (4)50005
Karnataka6 (30)80008
Kerala8 (14)1800018
Lakshadweep1 (1)10001
Andaman & Nicobar2 (3)70007
South India29 (136)4900049

Date wise High Rainfall Events In the table below we have given total daily high rainfall events in the same categories as above (50-100 mm, 100-150 mm, 150-200 mm, 200+ mm) in districts of India in August 2021.

Date in Aug 2021No of district days when rainfall 50-100 mmNo of district days when rainfall 100-150 mmNo of district days when rainfall 150-200 mmNo of district days when rainfall over 200 mmTotal No of district days when rainfall over 50 mm
12230025
21960025
3652114
41230015
51100011
6910010
71330016
8820010
970007
101520017
111030013
121431018
132221025
141021013
151000010
1640004
1760006
18910010
191201013
202010021
211621019
2290009
231211014
2431004
25910010
261632021
272210023
281410015
291410015
301200012
3150106
TOTAL IN AUG 202137148111431

INDIA

RegionDistricts that had over 50 mm rainfall at least on one day in June 2021 (Total no of districts)No of district days when rainfall 50-100 mmNo of district days when Rainfall 100-150 mmNo of district days when Rainfall 150-200No of district days when Rainfall over 200 mmTotal no of district days when rainfall over 50 mm
North East44 (86)1092060135
East71 (185)1101100121
North16 (101)1921022
West56 (186)841541104
South29 (136)4900049
INDIA216 (694)37148111431

SANDRP (ht.sandrp@gmail.com)

END NOTES:

[i] https://sandrp.in/2021/09/01/june-aug-2021-district-wise-rainfall-in-indias-sw-monsoon/

[ii] https://sandrp.in/2021/07/23/high-rainfall-days-in-indias-districts-in-june-2021/

[iii] https://sandrp.in/2021/08/06/july-2021-high-rainfall-days-in-indias-districts/

[iv] https://sandrp.in/2021/07/31/june-july-2021-district-wise-sw-monsoon-rainfall-in-india/

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