Definition:
Zones defined by FAO on the basis of the average annual length or growing period for crops, which depends mainly on precipitation and temperature. They are:
- Humid (>270);
- Moist subhumid (180-269 days);
- Dry subhumid (120-179 days);
- Semi-arid (60-119 days);
- Arid (0-59 days).
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Source:
Food and Agriculture Organization of the United Nations, AQUASTAT Web Site
FAO. 2008. Water and the rural poor: interventions for improving livelihoods in sub-Saharan Africa. Edited by: Jean-Marc Faurès and Guido Santini. FAO, Rome.