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Table 3

Classification of rainfall regime based on standard ranges of SPI

SPI valuesRainfall regime
≥2.00 Extremely wet 
1.50–1.99 Very wet 
1.00–1.49 Moderately wet 
−0.99 to 0.99 Near normal 
−1.00 to −1.49 Moderately dry 
−1.50 to −1.99 Severely dry 
≤−2.00 Extremely dry 
SPI valuesRainfall regime
≥2.00 Extremely wet 
1.50–1.99 Very wet 
1.00–1.49 Moderately wet 
−0.99 to 0.99 Near normal 
−1.00 to −1.49 Moderately dry 
−1.50 to −1.99 Severely dry 
≤−2.00 Extremely dry 

Source: (Hayes et al. 1999).

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