Aridity Indices

Hyperarid zone: P ¸ PE <0.03
Arid zone: P ¸ PE = 0.03 to 0.20
Semiarid zone: P ¸ PE = 0.20 to 0.50
Dry subhumid zone: P ¸ PE = 0.50 to 0.65
Moist subhumid zone: P ¸ PE = 0.65 to 0.75
Definitions
Precipitation (P)
Potential evaporation (PE)
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This site last updated April 8, 1998