Table 1.

Classification of SPEI values based on two different thresholds found in the literature.

SPEI15,53,54	SPEI52	Category
2 and above	1.83 and above	Extremely wet
1.5 to 1.99	1.43 to 1.82	Very wet
1.0 to 1.49	1.0 to 1.42	Moderately wet
−0.99 to 0.99	−0.99 to 0.99	Near Normal
−1.0 to −1.49	−1.0 to −1.42	Moderately dry
−1.5 to −1.99	−1.43 to −1.82	Severely dry
−2 and less	−1.83 and less	Extremely dry