Environmental Systems Research

Table 2 Drought classes and corresponding standardized precipitation index values

From: Perception of Impacts of Climate Variability on Pastoralists and Their Adaptation/Coping Strategies in Fentale District of Oromia Region, Ethiopia

SPI values	Drought classes
≥ 0	No drought
0 to − 0.99	Mild drought
−1.00 to − 1.49	Moderate drought
–1.5 to − 1.99	Severe drought
≤ –2	Extreme drought

Source: McKee et al. (1993)

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