In the just concluded month of July 2021, India received 266.1 mm rainfall, that is 6.73% below normal July rainfall of 285.3 mm, as per India Meteorological Department (IMD). This is in contrast with June 2021 rainfall, that was almost 11% surplus over Normal rainfall. Not only that surplus has been wiped out by the July 2021 deficit, the overall June July 2021 rainfall now is 449 mm, or about 0.7% below normal rainfall of 452.2 mm, as per IMD.
This pattern of (18%) surplus June Rainfall followed by (10%) deficit July rainfall wiping out that surplus is almost exactly same as what happened in June July 2020 monsoon. Let us see if the rest of 2021 monsoon also follows the SW Monsoon 2020 pattern.
STATE WISE RAINFALL As we can see from IMD Map above, out of 37 states and Union Territories (UT) of India, six had Surplus, 18 had normal, 12 had deficit and one (Manipur) had large deficit rainfall in June-July 2021. Telangana had the highest surplus rainfall of 55%. Ladakh had the lowest rainfall of 12.8 mm in these two months. Goa had the highest rainfall at 2267 mm in the first two months of SW Monsoon 2021.
SUB DIVISION WISE RAINFALL During June July 2021, out of 36 Meteorological sub divisions of India as per IMD, one (Rayalseema) had Large Surplus, nine had Surplus, 19 had normal and seven had deficit rainfall. Lakshadweep had the highest deficit (49%) rainfall. W Rajasthan had the lowest rainfall (130.9 mm) and Konkan & Goa had the highest rainfall (2402.7 mm).
RIVER BASIN WISE RAINFALL During the first two months of SW Monsoon of India in 2021, going by IMD’s River Basin wise map, a number of river basins has NO RAINFALL, including Upper Brahmaputra, Barak, Imphal and Others, Nagvati, East flowing rivers between Krishna and Pennar and Vaippar-Pamba basins. This is clearly an IMPOSSIBILITY, showing callousness of IMD in reporting river basin wise rainfall. In some basins like Upper Indus and Jhelum IMD reports NO DATA, which is also shocking.
Some basins have LARGE DEFICIT rainfall include: East flowing rivers between Krishna and Godavari, Vamsadhara, Lower Bhima, Kynchiang (Meghalaya). IMD reports Lower Bhima basin getting just 12 mm rainfall, 96% below rainfall, which clearly looks an impossibility. Similarly the low rainfall reported of Vamsadhara and East Flowing rivers between Krishna and Godavari seems impossible figures. All this tends to discredit whatever value is there in providing river basin wise figures. Chambal is reported to get the highest surplus % rainfall of 365%. West flowing rivers south of Tapi seems to have the highest rainfall of 1556.3 mm.
DISTRICT WISE RAINFALL FOR EACH STATE OF INDIA
NORTHEAST INDIA: Assam
EAST INDIA: W Bengal
SOUTH INDIA: Andhra Pradesh
WEST INDIA: Goa
NORTH INDIA: Jammu & Kashmir
Delhi The Delhi state in July 2021 had the wettest July since 18 years. Delhi recieved 507 mm of rain in July, far above its average July rainfall of 210.6 mm.