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Table 1

Categories of SPEI (Li et al. 2015)

Moisture categorySPEI
Extremely wet 2.00 and above 
Very wet 1.50 to 1.99 
Moderately wet 1.00 to 1.49 
Near normal −0.99 to 0.99 
Moderately dry −1.00 to −1.49 
Severely dry 1.50 to1.99 
Extremely dry −2.00 and below 
Moisture categorySPEI
Extremely wet 2.00 and above 
Very wet 1.50 to 1.99 
Moderately wet 1.00 to 1.49 
Near normal −0.99 to 0.99 
Moderately dry −1.00 to −1.49 
Severely dry 1.50 to1.99 
Extremely dry −2.00 and below 
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