SPEI value | Drought category |
>2 | Extremely wet |
1.50 to 1.99 | Very wet |
1.0 to 1.49 | Moderately wet |
−0.99 to 0.99 | Near normal |
−1.0 to −1.49 | Moderately dry |
−1.50 to −1.99 | Severely dry |
−2 and less | Extremely dry |