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Environmental Systems Research

Table 2 SPI classification

From: Climate vulnerability of coffee-cocoa agrosystems in the sub-humid mountain ecosystems in south-west Togo (West Africa)

SPI Classes

Description

SPI > 2

Extremely wet

1 < SPI < 2

Very wet

0 < SPI < 1

Moderately wet

− 1 < SPI < 0

Moderate drought

− 2 < SPI < − 1

Severe drought

SPI < − 2

Extreme drought

  1. Negative annual values indicate drought compared to the selected reference period and positive values indicate wet conditions
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