SPI VALUES

INTERPRETATION

−2.0 and less

Extremely dry

−1.5 to −1.99

Severely dry

−1.0 to −1.49

Moderately dry

−0.99 to +0.99

Near normal

1.0 to 1.49

Moderately wet

1.5 to 1.99

Very wet

2.0 and above

Extremely wet