According to India Meteorological Department (IMD), during the Post Monsoon Rainfall for 2024, that included rainfall during the three Oct-Dec 2024 months, India received 117.4 mm rainfall, 3% below normal (110.7 mm, 9% below normal in Post Monsoon 2023[i], 144.1 mm, 19% above normal in Post Monsoon 2022[ii] and 177.7 mm rainfall, 43.54% above normal in Post Monsoon 2021[iii]) rainfall of 121 mm. In the same period in 2020, India received 124.6 mm rainfall, 0.64% above the normal rainfall. As per IMD[iv] definition, the rainfall in Post Monsoon 2024 was in Normal Rainfall category.
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High Rainfall days in India’s districts in Sept 2024: Highest numbers in East India
An analysis of the daily district wise rainfall data from India Meteorological Department (IMD) for the month of September 2024, the last month of India’s South West Monsoon 2024 shows that there were 546 (406 in Sept 2023[i], 417 in Sept 2022[ii] and 489 in Sept 2021[iii]) instances when district rainfall of a day was above 50 mm. Such high rainfall instances included 438 (330, 365 and 374 in Sept 2023, Sept 2022 and 2021 respectively) instances in Sept 2024 when rainfall was 50-100 mm, 73 (64, 47 and 84 in Sept 2023, Sept 2022 and 2021 respectively) instances in Sept 2024 when it was 100-150 mm, 30 (10, 3 and 20 in Sept 2023, Sept 2022 and 2021 respectively) times in Sept 2024 when it was 150-200 mm and 5 (2, 2 and 11 in Sept 2023, Sept 2022 and 2021 respectively) instances in Sept 2024 when rainfall in a day was above 200 mm.
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SW Monsoon 2024: District wise rainfall in India
In the just concluded South West Monsoon 2024, India received 934.8 mm (820 mm in SW Monsoon 2023, 925 mm in SW Monsoon 2022[i]) rainfall, about 107.6% (94.45 % in 2023, 106.5% in 2022) of the Normal SW Monsoon rainfall of 868.6 mm as per India Meteorological Department (IMD). This rainfall is categorised as above normal rainfall.
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June Aug 2024: District wise rainfall in India’s SW Monsoon
In the just concluded month of Aug 2024, India received just 295.2 mm (162.7 mm or 36.2% below normal in Aug 2023[i], 263.8 mm in Aug 2022, 3.5% above the normal[ii]) or 15.8% above normal rainfall of 254.9 mm as per India Meteorological department (IMD). In Aug 2021, the rainfall was 195.9 mm[iii], about 24.13% below normal and in Aug 2020, the rainfall was 327 mm[iv], or about 26.6% above normal.
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June 2024: District wise rainfall in India’s SW Monsoon
In the just concluded month June 2024, the first month of India’s South West 2023 monsoon, India received 147.2 mm rainfall, 11% below the normal June rainfall of 165.3 mm as per India Meteorological department. In June 2023 rainfall was 148.6 mm (10% below normal)[i], in June 2022 the rainfall was 152.3 mm (8% below normal)[ii], in June 2021, the rainfall was 182.9 mm[iii] (about 11% above normal) and in June 2020, the rainfall was 196.9 mm (about 18% above normal) and in June 2019 it was 33% below normal. So in six years from 2019 to 2024, India had below normal rainfall in 4 years in June, and above normal in two years (2020 and 2021). Six times in last ten years and nine times since 2008 June rainfall was below normal.
However, the distribution of rainfall has been far from normal in June 2024, both temporally and spatially.
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Pre Monsoon 2024 season: District wise rainfall in India
In the just concluded three month pre monsoon season (March 1 to May 31, 2024) India received 125.9 mm (146.6 mm in Pre Monsoon 2023[i]) rainfall, 4% below (12% above in per monsoon 2023) the normal rainfall of 130.6 mm as per the India Meteorological Department (IMD). In 2020[ii] , 2021[iii] and 2022[iv] India received 158.5 mm, 155.2 mm and 130.6 or 20% above normal, 18% above normal and 1% below rainfall respectively. So this year, India has received the lowest pre monsoon season rainfall compared to that those in previous four years.
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SW Monsoon 2023: District wise rainfall in India
In the just concluded South West Monsoon 2023, India received 820 mm (925 mm in SW Monsoon 2022[i]) rainfall, about 94.45 % (106.5% in 2022) of the Normal SW Monsoon rainfall of 868.6 mm or 5.55% (6.5% above normal in 2022) below normal SW Monsoon rainfall as per India Meteorological Department (IMD). This rainfall will now be categorised as below normal rainfall though the distribution has been unprecedented, both temporally and spatially.
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June July 2023: District wise rainfall in in India’s SW Monsoon
In the month of July 2023, the second month of India’s South West 2022 monsoon, India received 318.4 mm (327.7 mm in July 2022[i]) rainfall, 13.5 % above (16.8% above normal in July 2022) the normal July rainfall of 280.5 mm as per India Meteorological department. In July 2021, the rainfall was 266.1 mm[ii], about 6.7% below normal and in July 2020, the rainfall was 257.1 mm[iii], or about 9.9% below normal.
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June 2023: District wise rainfall in India’s SW Monsoon
In the just concluded month June 2023, the first month of India’s South West 2023 monsoon, India received 148.6 mm rainfall, 10% below the normal June rainfall of 165.3 mm as per India Meteorological department. In June 2022, the rainfall was 152.3 mm, 8% below normal, in June 2021, the rainfall was 182.9 mm[i], about 11% above normal and in June 2020, the rainfall was 196.9 mm, or about 18% above normal and in June 2019 it was 33% below normal.
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Pre Monsoon 2023: District Wise Rainfall in India
In the just concluded three month pre monsoon season (March 1 to May 31, 2023) India received 146.6 mm rainfall, 12% above the normal rainfall of 130.6 mm as per the India Meteorological Department (IMD). In 2020[i] , 2021[ii] and 2022[iii] India received 158.5 mm, 155.2 mm and 130.6 or 20% above normal, 18% above normal and 1% below rainfall respectively. So this year, India has received much higher pre monsoon season rainfall in 2023 compared to that in 2022, but lower than that in 2021 and 2020.
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