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Table 4

The drought classification based on the SPI

Wet or drought severityIndex value
Extremely wet SPI ≥ +2 
Severely wet +1.99 ≥ SPI ≥ +1.5 
Moderately wet +1.49 ≥ SPI ≥ +1 
Near normal +0.99 ≥ SPI ≥ −0.99 
Moderate drought −1 ≥ SPI ≥ −1.49 
Severe drought −1.5 ≥ SPI ≥ −1.99 
Extreme drought SPI ≤ −2 
Wet or drought severityIndex value
Extremely wet SPI ≥ +2 
Severely wet +1.99 ≥ SPI ≥ +1.5 
Moderately wet +1.49 ≥ SPI ≥ +1 
Near normal +0.99 ≥ SPI ≥ −0.99 
Moderate drought −1 ≥ SPI ≥ −1.49 
Severe drought −1.5 ≥ SPI ≥ −1.99 
Extreme drought SPI ≤ −2 
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