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Table 2

Drought-level standards and the threshold values

Index valueCategory
>2.00 Extreme wet 
1.99 to 1.50 Very wet 
1.49 to 1.00 Moderate wet 
0.99 to 0.00 Near normal 
0.00 to −0.99 Mild drought 
−1.00 to −1.49 Moderate drought 
−1.50 to −1.99 Severe drought 
≤−2.00 Extreme drought 
Index valueCategory
>2.00 Extreme wet 
1.99 to 1.50 Very wet 
1.49 to 1.00 Moderate wet 
0.99 to 0.00 Near normal 
0.00 to −0.99 Mild drought 
−1.00 to −1.49 Moderate drought 
−1.50 to −1.99 Severe drought 
≤−2.00 Extreme drought 
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