(f)
Figure 11 Spatial variation of rainfall during month of (a) November, (b) December, (c) January, (d) February, (e) March, (f) April
There is a decrease in the amount of rainfall received during November- December. November receives a maximum rainfall of 53 mm in region of North Cachar hills, while the other districts receive precipitations as low as 4mm (Dhubri region). Assam receives the minimum amount of rainfall in December (Figure 11. b) with highest (17 mm) of rainfall in Cachar region to minimum (1-2 mm) in Kokrajhar region. In January, (Figure 11. c) we can see that the precipitation varies from 5 mm to 32 mm, with districts of upper Assam (Dhemaji, Tinsukia and Dibrugarh) receiving the maximum rainfall while Cachar, Nalbari and Kokrajhar receives minimum. While, in month of February (Figure 11. d) there is a subtle increase in the amount of precipitation received for upper Assam and the value reaches to 60 mm to 70 mm and minimum reaches to 10 mm to 15 mm in Kokrajhar and Dhubri districts of lower Assam. In March, (Figure 11. e) the region starts to receive more precipitation and the maximum rainfall received varies between 150 mm to 170 mm, in districts of upper Assam. In April (Figure 11. f) whole of the region receives rainfall of substantial amount with regions surrounded by state boundary receiving maximum rainfall amounting to 375 mm to 415 mm in Cachar region, while the middle Assam is still receiving relatively low precipitation which is 100 mm – 110 mm.