| SPI | Category | Number of time in 44 years | Percentage of occurrence | Severity of events |
| ≥2 | Extremely wet | 0 | 0% | -- |
| 1.5 - 1.99 | Severely wet | 10 | 5.7% | 1 in 4.4 years |
| 1 - 1.49 | Moderately wet | 30 | 16.9% | 1 in 1.5 years |
| 0 - 0.99 | Mild wetness | 51 | 28.8% | 1 in 0.86 year |
| 0 to −0.99 | Mild dryness | 44 | 24.9% | 1 in 1 year |
| −1 to −1.49 | Moderately dry | 19 | 10.7% | 1 in 2.3 years |
| −1.5 to −1.99 | Severely dry | 13 | 7.3% | 1 in 3.4 years |
| ≤−2 | Extremely dry | 10 | 5.7% | 1 in 4.4 years |
| Total | 177 | 100% |
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