Future Changes in Drought Characteristics under Extreme Climate Change over South Korea

Table 4

A classification of the SPI that classifies the SPI into extreme, severe, and moderate classes for both wet and dry moisture condition.

SPI value	Drought class
More than +2.00	Extremely wet
+1.50 to +1.99	Very wet
+1.00 to +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
Less than −2.00	Extremely dry