Table 1: Monthly rainfall characteristics over recharge areas of the WAB.
| Parameter | Unit | Monthly rainfall characteristics* | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | ||
| Mean | mm | 0.2 | 17.5 | 62 | 119.1 | 138.2 | 116.2 | 77.7 | 24.5 | 3.6 |
| Annual average | % | 0.00% | 3.10% | 11.10% | 21.30% | 24.70% | 20.80% | 13.90% | 4.40% | 0.60% |
| Standard deviation | mm | 0.6 | 17.4 | 56 | 77.2 | 69.2 | 69 | 41.6 | 32.9 | 6.8 |
| Maximum | mm | 3 | 66 | 235 | 350 | 387 | 325 | 168 | 180 | 33 |
| Minimum | mm | 0 | 0 | 3 | 12 | 36 | 28 | 7 | 0 | 0 |
*No rainfall has been recorded during June, July and August.