| Variables | SPI ranges | Interpretation | % Years |
|
| SPI > 2 | Humidity extreme | 4 |
|
| 1 < SPI < 2 | High humidity | 13 |
| Rainfall (1960-2013) | 0 < SPI < 1 | Moderate humidity | 47 |
|
| −1 SPI 0 | Moderate drought | 25 |
|
| −2 < SPI < −1 | With drought | 11 |
|
| SPI > 2 | Humidity extreme | 5 |
|
| 1 < SPI < 2 | High humidity | 29 |
| Hydrometry (1972-2013) | 0 < SPI < 1 | Moderate humidity | 24 |
|
| −1 < SPI < 0 | Moderate drought | 27 |
|
| −2 < SPI < −1 | With drought | 15 |