The six maps above show spatial patterns of SPI for six different periods ranging from one month to 48 months, according to the selected year and month.
| label | SPI1 | SPI3 | SPI6 | SPI12 | SPI24 | SPI48 |
| monthly scale | 1 | 3 | 6 | 12 | 24 | 48 |
Clasification of SPI values:
| SPI Values | Category |
| >= 2.0 | Extremely Wet |
| 1.5 to 1.99 | Severely Wet |
| 1.0 to 1.49 | Moderately Wet |
| -0.99 to 0.99 | Near Normal |
| -1.0 to -1.49 | Moderately Dry |
| -1.5 to -1.99 | Severely Dry |
| <= -2.0 | Extremely Dry |