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.