| Drought Index | Number of months and percent occurrence | |||||
| Extreme | Severe | Moderate | Mild | Normal | Total and % number of drought incidence/probability | |
| SPI-3 | 1 | 1 | 23 | 37 | 488 | 62 (11) |
| SPAI-3 | 12 | 24 | 51 | 188 | 275 | 275 (50) |
| SPI-6 | 10 | 21 | 38 | 219 | 259 | 288 (53) |
| SPAI-6 | 12 | 24 | 50 | 188 | 273 | 274 (50) |
| SPI-12 | 7 | 20 | 53 | 209 | 252 | 289 (53) |
| SPAI-12 | 12 | 24 | 49 | 186 | 270 | 271 (9) |