During the just concluded first half of the South West Monsoon 2020, India received 453.3 mm rainfall, just 1.1 mm above the normal rainfall of 452.2 mm during the period. The Surplus of 18% rainfall that India received in June 2020 has thus been wiped out by the 9.9% deficit in July rainfall. Normal rainfall in July 2020 is 285.3 mm, while actual rainfall was 257.1 mm. IMD does not provide monthly figures of rainfall for different states, sub divisions and river basins, which it should along with comparison with respect to normal rainfall and rainfall last year.
To get July 2020 rainfall, we will need to use the figures given in this article along with the figures of June 2020 rainfall (see: https://sandrp.in/2020/06/30/district-wise-rainfall-in-india-in-june-2020/). The district wise figures of June-July 2020 rainfall can be seen in this PDF file from IMD: IMD DISTRICT WISE RAINFALL FROM JUNE 1 TO JULY 31 2020.
State Wise Rainfall As one can see from the feature image above, which is IMD map of state wise rainfall in June-July 2020, Sikkim is the only state that shows Large Excess (89%) among all the states during first two months of monsoon and Ladakh in North is the only Union Territory (UT) showing Large Deficit (-61%). Six states/ UTs have excess (20-59%) rainfall (Meghalaya, Bihar, Telangana, Andhra Pradesh, Tamil Nadu, Puducherry), 19 states/ UTs have Normal (+19 to -19%) and ten states have Deficit (-20 to -59%) rainfall.
Sub Division wise rainfall
As one can see from the IMD map above, IMD has 36 Meteorological sub divisions (SD) of IMD, These need to be reformulated as there is lack of sufficient rigour in the way sub divisions are formed, to illustrate, low rainfall solarpur and high rainfall Kolahpur both are included in Madhya Maharashtra. Only one sub-division had large Excess: interestingly, its drought prone Rayalseema, with massive 119% excess rainfall over normal rainfall, that too quite well distributed rainfall. Ten other SD have Excess (20-59%), 18 have normal (+19 to -19%) and seven had Deficit (-20 to -59%) rainfall.
River Basin wise rainfall
It is good that IMD also provides river basin wise rainfall as can be seen from above map. One problem with this reporting is that for some river basins, IMD is unable to include rainfall information due to lack of space on the map, so IMD should also provide this information in tabular form. Secondly, some of the river basins are composite river basins, but would be good if IMD were to break them into river basins. In case of massive and very important Brahmaputra basin, IMD only provides rainfall for Lower and Upper Brahmaputra basins, which is clearly inadequate. Rainfall for a number of individual sub basins including that for Subansiri, Siang, Lohit, Dibang, Tawang, Kameng, Beki, Teesta, Pagladiya, Manas, Sankosh, Raidhaka among Northern Tributaries and Dhansiri, Nao Dehing, Burhi Dehing, Dikhow, Kopili, among Southern Tributaries, among others may be given separately.
Interestingly, during June July 2020, at least eight river basins were shown to have Large Excess, including: Kosi, Kynchiang, Upper Godavari, East flowing rivers from Godavari to Krishna, Tungabhadra, Pennar, Pennar-Palar and one more sub basin whose name is not given by IMD for lack of space! Ten sub basins had Excess, Thirteen had deficit, two had NO DATA and rest had normal rainfall. This is too important an information to deal with callously.
STATE WISE DISTRICT WISE RAINFALL
NORTH EAST INDIA
Jammu & Kashmir
Delhi As can be seen in the map below, North West Delhi, where SANDRP is situated, had massive 67% deficit in rain and had so far just 73.1 mm rainfall against normal of 223.4 mm.
India hopes that the remaining two months of the rainfall will be better and will bring less floods and more distributed rainfall.