| Rainfall (mm) | Seasonal mean | Annual | Rainy days | Standard deviation | ||||||||
| DJF | MAM | JJAS | ON | DJF | MAM | JJAS | ON | Annual | Rainy days | |||
| Trans-Himalaya | 20 | 50 | 327 | 24 | 421 | 113 | 11.2 | 15.8 | 49.3 | 16.8 | 59.3 | 9 |
| Middle mountains | 35 | 206 | 1210 | 79 | 1530 | 189 | 23.2 | 48.9 | 113 | 43.8 | 145.7 | 14 |
| Southern plains | 22 | 102 | 891 | 72 | 1087 | 130 | 14.7 | 46.8 | 192 | 59.1 | 213.7 | 14 |
| Whole basin | 26 | 122 | 818 | 58 | 1025 | 171 | 14.0 | 35.4 | 93.0 | 36.4 | 115.4 | 13 |
| % of annual | 2.5 | 11.9 | 79.8 | 5.7 |
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