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Table 3

Classification of SPI values

SPIClassification
≥2.00 Extreme wet 
1.50 to 1.99 Severe wet 
1.00 to 1.49 Moderate wet 
0.50 to 0.99 Mild wet 
−0.49 to 0.49 Near normal 
−0.99 to −0.50 Mild drought 
−1.49 to −1.00 Moderate drought 
−1.99 to −1.50 Severe drought 
<− 2.00 Extreme drought 
SPIClassification
≥2.00 Extreme wet 
1.50 to 1.99 Severe wet 
1.00 to 1.49 Moderate wet 
0.50 to 0.99 Mild wet 
−0.49 to 0.49 Near normal 
−0.99 to −0.50 Mild drought 
−1.49 to −1.00 Moderate drought 
−1.99 to −1.50 Severe drought 
<− 2.00 Extreme drought 

Source:Du et al. 2013; Pei et al. 2013.

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