Monsoon · Rainfall

July 2021: High Rainfall days in India’s districts

An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for the month of July 2021, the 2nd month of India’s South West Monsoon 2021 shows that there were 717 instances when district rainfall of a day was above 50 mm. [Considering that the normal monthly rainfall of India July is 285.3 mm, the average daily rainfall in this month is about 9.2 mm.] Such high rainfall instances included 595 instances when rainfall was 50-100 mm, 98 instances when it was 100-150 mm, 17 times it was 150-200 mm and 7 times above 200 mm. Interestingly, in June 2021[i] too 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[ii], the July 2021 rainfall all over India was 6.7% below normal.

Out of 694 districts of India, 357 districts or about 51.4 of the districts experienced this. There were many districts that had more than one such high rainfall days in July 2021. The highest number of such instances were seen again (like in June 2021 when there were 48 such instances in this region) in Konkan region of Maharashtra, where for the seven districts that belong to this meteorological sub division, there were 56 instances when rainfall was above 50 mm. Telangana was close second with 49 instances involving 28 of Telangana’s 33 districts. Incidentally, Assam, which had 46 such instances in June 2021, had much lower, 31 such instances involving 15 of its 27 districts.

Among the five regions of India (North, South, East, West and North East), West India had the highest number of such instances (156), followed by East India (135) and South India (134). North East India had the least such instances at 77.

North East India July is supposed to be higher rainfall months compared to June and yet in 2021 SW Monsoon, there are LESS high rainfall district days in July 2021 compared to those in June 2021, in each of the categories (50-100 mm, 100-150 mm, 150-200 mm, above 200 mm and TOTAL of all) as can be seen when we compare the figures in the table below and those for June 2020, see: https://sandrp.in/2021/07/23/high-rainfall-days-in-indias-districts-in-june-2021/.

StateDistricts that had over 50 mm rainfall at least on one day in July 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)80008
Assam15 (27)2830031
Meghalaya4 (7)11320014
Nagaland4 (11)50005
Manipur2 (9)20002
Mizoram6 (8)90009
Tripura4 (4)32005
Sikkim3 (4)40004
North East India38 (86)6980077

East India The number of high rainfall district days in July 2021 is higher than in June 2021 in all states of East India as can be seen table below, except for Bihar, where such events came down from 42 in June 2021 to 24 in July 2021.

StateDistricts that had over 50 mm rainfall at least on one day in July 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 Bengal15 (19)2582136
Odisha15 (30)1430017
Jharkhand17 (24)1952026
Bihar16 (38)2310024
Uttar Pradesh39 (74)5440058
East India102 (185)1352141161

North India

State/ Union TerritoryDistricts that had over 50 mm rainfall at least on one day in July 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
Uttarakhand9 (13)1900019
Haryana17 (22)2550030
Chandigarh0 (1)00000
Delhi8 (9)1800018
Punjab10 (22)1600016
Himachal Pradesh6 (12)1020012
Jammu & Kashmir7 (20)1320116
Ladakh0 (2)00000
North India57 (101)101901111

West India

StateDistricts that had over 50 mm rainfall at least on one day in July 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
Rajasthan11 (33)1500015
Madhya Pradesh32 (51)4081049
Diu Daman1 (2)40015
Gujarat19 (34)2250027
Dadra Nagarhaveli1 (1)32005
Goa2 (2)791017
Maharashtra20 (36)45238480
Chhattisgarh14 (27)2020022
West India100 (186)15650105221

South India

StateDistricts that had over 50 mm rainfall at least on one day in July 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 Pradesh2 (13)30003
Telangana28 (33)4333049
Tamil Nadu5 (38)50005
Puducherry2 (4)40004
Karnataka10 (30)3250037
Kerala13 (14)4020042
Lakshadweep0 (1)00000
Andaman & Nicobar3 (3)70007
South India61 (136)1341030147

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 July 2021, the second month of SW Monsoon 2021. The Highest number of such high rainfall district days events happened on 19th July (54 events) and 23rd July (47 events). The lowest number of such events happened on July 6 (2 events) and July 7 (3 events).

Date in July 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
153008
21610017
380008
424006
530003
620002
750005
81520017
91500015
101800018
111310014
121541019
132640030
142270029
152141026
162340128
1772009
181671226
1937143054
203350139
212500025
223324039
233592147
242350028
251600117
262870035
271411016
284000040
2922105
302951136
312952036
TOTAL IN JULY 202159598177717

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 East38 (86)6980077
East102 (185)1352141161
North57 (101)101901111
West100 (186)15650105221
South61 (136)1341030147
INDIA357 (694)59598177717

SANDRP (ht.sandrp@gmail.com)

END NOTES:

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

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

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