等级

类型

SPEI

1

无旱

−0.5 < SPEI

2

轻旱

−1.0 < SPEI ≤ −0.5

3

中旱

−1.5 < SPEI ≤ −1.0

4

重旱

−2.0 < SPEI ≤ −1.5

5

特旱

SPEI ≤ −2.0