SPI

Category

SPI > 2.0

Extremely wet

1.5 SPI 1.99

Severely wet

1.0 SPI 1.49

Moderately wet

−0.99 SPI 0.99

Near normal

−1.0 SPI −1.49

Moderately drought

−1.5 SPI −1.99

Severely drought

SPI < −2

Extremely drought