SPI values | Category |
2.00 and above | Extremely wet |
1.50 to 1.99 | Very wet |
1.00 to 1.49 | Moderately wet |
−0.99 to 0.99 | Near Normal |
−1.00 to −1.49 | Moderately dry |
−1.50 to −1.99 | Severely dry |
−2.00 and less | Extremely dry |