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Rainfall variability
Rainfall variability at a time scale from years to days is as much a characteristic of climate as the total amounts recorded.
Low values, however, do not necessarily lead to drought, nor is drought necessarily associated with low rainfall. Agricultural drought occurs when water supply is insufficient to cover crop or livestock water requirements. In addition to reduced rainfall, a number of factors may lead to agricultural drought, some of them not always obvious.

Rainfall Variability and Drought in Sub-Saharan Africa
Analysis of rainfall variability and drought in the 1961-2002 period at global level

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