Table 1: Classification standard of the meteorological drought composite index (CI).

LevelClassCI

1No drought−0.6 < CI
2Slight drought−1.2 < CI ≤ −0.6
3Moderate drought−1.8 < CI ≤ −1.2
4Heavy drought−2.4 < CI ≤ −1.8
5Extreme droughtCI ≤ −2.4