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Table 5 presents the distribution of the rainfall events in terms of the rainfall intensity classifications. Among the seven classes, the very light rain (0 to 1 mm/d) class has the highest probability, and the extreme rain (>50 mm/d) class has the lowest probability in both the SPPs and gridded precipitation product.

Table 5

Probability of occurrence precipitation and their rainfall quantity percentage for comparison of precipitation products (IMD, TRMM, GPM-IMERG, and PERSIANN) based on World Meteorological Organization standards during the period of 2000–2018

Rainfall category (mm)Number of Days
Precipitation quantity (%)
IMDTRMMGPMPERSIANNIMDTRMMGPMPERSIANN
Dry days 0 3,519 1,226 3,067 3,356 0 0 0 0 
Very light rain 0 to 1 930 3,094 1,346 943 1.6 2.8 2.1 1.0 
Light rain 1 to 2 447 471 478 352 2.7 2.7 2.8 1.4 
Low moderate rain 2 to 5 726 709 714 576 9.7 8.9 9.5 5.2 
High moderate rain 5 to 10 571 615 592 514 16.8 16.9 16.7 9.9 
Low heavy rain 10 to 20 472 514 446 584 26.9 26.8 24.7 22.3 
High heavy rain 20 to 50 230 268 250 516 27.9 29.9 29.4 41.3 
Extreme rain >50 45 43 47 99 14.3 12.0 14.9 18.8 
Total – 6,940 6,940 6,940 6,940 100 100 100 100 
Rainfall category (mm)Number of Days
Precipitation quantity (%)
IMDTRMMGPMPERSIANNIMDTRMMGPMPERSIANN
Dry days 0 3,519 1,226 3,067 3,356 0 0 0 0 
Very light rain 0 to 1 930 3,094 1,346 943 1.6 2.8 2.1 1.0 
Light rain 1 to 2 447 471 478 352 2.7 2.7 2.8 1.4 
Low moderate rain 2 to 5 726 709 714 576 9.7 8.9 9.5 5.2 
High moderate rain 5 to 10 571 615 592 514 16.8 16.9 16.7 9.9 
Low heavy rain 10 to 20 472 514 446 584 26.9 26.8 24.7 22.3 
High heavy rain 20 to 50 230 268 250 516 27.9 29.9 29.4 41.3 
Extreme rain >50 45 43 47 99 14.3 12.0 14.9 18.8 
Total – 6,940 6,940 6,940 6,940 100 100 100 100 
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