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