| Mositure Grade | Extremely wet (EW) | Severely wet (SW) | Moderately wet (MW) | Near normal (NN) | Moderately dry (MD) | Severely dry (SD) | Extremely dry (ED) |
| SPEI | ≥2.00 | 1.50 - 1.99 | 1.00 - 1.49 | −0.99 - 0.99 | −1.00 - −1.49 | −1.50 - −1.99 | ≤−2.00 |