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Table 2

Drought classification by SPI value (Lloyd-Hughes & Saunders 2002)

SPI valueCategory
2.00 or more Extremely wet 
1.50 to 1.99 Severely wet 
1.00 to 1.49 Moderately wet 
0 to 0.99 Mildly wet 
0 to −0.99 Mild drought 
−1.00 to −1.49 Moderate drought 
−1.50 to −1.99 Severe drought 
−2 or less Extreme drought 
SPI valueCategory
2.00 or more Extremely wet 
1.50 to 1.99 Severely wet 
1.00 to 1.49 Moderately wet 
0 to 0.99 Mildly wet 
0 to −0.99 Mild drought 
−1.00 to −1.49 Moderate drought 
−1.50 to −1.99 Severe drought 
−2 or less Extreme drought 
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