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Table 3 Climatic variables. Drought classification of Standardized Precipitation Index (SPI) values (source: Lloyd-Hughes and Saunders 2002).

From: Post-Fire Recovery of Eucalypt-Dominated Vegetation Communities in the Sydney Basin, Australia

SPI value Category
2.00 or greater Extremely wet
1.50 to 1.99 Severely wet
1.00 to 1.49 Moderately wet
0.00 to 0.99 Mildly wet
0.00 to −0.99 Mild drought
−1.00 to −1.49 Moderate drought
−1.50 to −1.99 Severe drought
−2.00 or less Extreme drought