Monsoon · Rainfall

High Rainfall days in India’s districts in Sept 2021

An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for the month of September 2021, the last month of India’s South West Monsoon 2021 shows that there were 489 instances when district rainfall of a day was above 50 mm. The normal monthly rainfall of India for Sept is 170.2 mm and actual rainfall was a huge 34.96% above normal at 229.7 mm[i], the actual average daily rainfall in this month was about 7.66 mm. Such high rainfall instances included 374 instances when rainfall was 50-100 mm, 84 instances when it was 100-150 mm, 20 times it was 150-200 mm and eleven times above 200 mm.

Interestingly, in June 2021[ii], July 2021[iii] and Aug 2021[iv] there were seven, seven and just one instances respectively when rainfall was above 200 mm, the eleven instances recorded in Sept 2021 is thus a record for this year. Similarly, the number of instances in Sept 2021 when rainfall was in the range 150-200 mm, at twenty is also a record for 2021 and such instances in June, July and Sept were five, seventeen and eleven. Detailed articles on June[v], July[vi] and Aug 2021[vii] provide more information about district wise, state wise rainfall in respective months.

Out of 694 districts of India, 278 districts or about 40.06% of the districts experienced such high rainfall in Sept 2021, many districts had more than one such high rainfall days. The highest number of such instances were seen (in June & July 2021 Konkan had the highest number of such instances, 48 & 56 respectively while in Aug, Meghalaya had the highest such numbers at 41 instances) in East Uttar Pradesh, where for the 42 districts (only 30 of them saw such instances) there were 45 instances when rainfall was above 50 mm. Odisha was second with 40 instances involving 22 of Odisha’s 30 districts. Incidentally, Assam had 46 such instances in June 2021, 31 in July 2021 and 26 in August 2021 and now 18 in Sept 2021.

Among the five regions of India (North, South, East, West and North East), West India had the highest number of such instances (173), followed by East India (149) and South India (82). North East India had the least such instances in Sept 2021 at 37.

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 Sept 2021.

StateDistricts that had over 50 mm rainfall at least on one day in Sep 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 Pradesh4 (16)50005
Assam13 (27)1611018
Meghalaya1 (7)10001
Nagaland2 (11)20002
Manipur0 (9)00000
Mizoram6 (8)71008
Tripura2 (4)20002
Sikkim1 (4)10001
North East India29 (86)3421037

East India

StateDistricts that had over 50 mm rainfall at least on one day in Sep 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 Bengal13 (19)17122334
Odisha22 (30)21106340
Jharkhand20 (24)1721222
Bihar3 (38)30003
Uttar Pradesh35 (74)33133150
East India93 (185)9137129149

North India

State/ Union TerritoryDistricts that had over 50 mm rainfall at least on one day in Sep 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
Uttarakhand1 (13)10001
Haryana10 (22)1300013
Chandigarh0 (1)00000
Delhi8 (9)1511017
Punjab9 (22)1010011
Himachal Pradesh2 (12)20002
Jammu & Kashmir3 (20)40004
Ladakh0 (2)00000
North India33 (101)4521048

West India

StateDistricts that had over 50 mm rainfall at least on one day in Sep 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
Rajasthan2 (33)20002
Madhya Pradesh14 (51)1500015
Diu Daman2 (2)60017
Gujarat20 (34)44172063
Dadra Nagarhaveli1 (1)42118
Goa2 (2)30003
Maharashtra20 (36)4881057
Chhattisgarh14 (27)1620018
West India75 (186)1382942173

South India

StateDistricts that had over 50 mm rainfall at least on one day in Sep 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 Pradesh6 (13)820010
Telangana22 (33)26112039
Tamil Nadu3 (38)30003
Puducherry3 (4)50005
Karnataka5 (30)70007
Kerala6 (14)71008
Lakshadweep0 (1)00000
Andaman & Nicobar3 (3)1000010
South India48 (136)66142082

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 September 2021.

Date in Sept 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
12070128
21752024
330003
480008
560006
630003
72893040
82510026
9940013
1030003
1180008
1290009
131552224
1419107137
152050227
162281031
171462123
1880008
1960006
2051006
2172009
221710018
231310014
241900019
2521003
2620002
271530018
282130024
2919100130
301123319
TOTAL IN SEPT 2021374842011489

INDIA

RegionDistricts that had over 50 mm rainfall at least on one day in Sept 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 East29 (86)3421037
East93 (185)9137129149
North33 (101)4521048
West75 (186)1382942173
South48 (136)66142082
INDIA278 (694)374842011489

SANDRP (ht.sandrp@gmail.com)

END NOTES:

[i] https://sandrp.in/2021/09/30/sw-monsoon-2021-district-wise-rainfall-in-india/  

[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/2021/09/02/high-rainfall-days-in-indias-districts-in-august-2021/

[v] https://sandrp.in/2021/06/30/june-2021-district-wise-rainfall-in-in-indias-sw-monsoon/

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

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

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