SN-SPI value Category
2 or more Extremely wet
1.5 to 1.99 Severely wet
1 to 1.49 Moderately wet
0 to 0.99 Mildly wet
0 to - 0.99 Mildly dry
-1 to -1.49 Moderately dry
- 1.5 to -1.99 Severely dry
- 2 or less Extremely dry
Table 2: Thresholds of SN-SPI for drought characterization.