Table 1.

Standardized precipitation index values and the corresponding categories

SPI valueClass for description
>2.00Extremely wet
1.5–1.99Very wet
1.0–1.49Moderately wet
−0.99–0.99Near normal
−1.00 to −1.49Moderately drought
−1.5 to −1.99Severely drought
<−2.00Extremely drought
Source(s): (McKee et al., 1993)
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