Palmer Drought Severity Index Classifications for Dry and Wet Periods
4.00 or more Extremely wet
3.00 to 3.99 Very wet
2.00 to 2.99 Moderately wet
1.00 to 1.99 Slightly wet
0.50 to 0.99 Incipient wet spell
0.49 to -0.49 Near normal
-0.50 to -0.99 Incipient dry spell
-1.00 to -1.99 Mild drought
-2.00 to -2.99 Moderate drought
-3.00 to -3.99 Severe drought
-4.00 or less Extreme drought
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