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Table 2

Rainfall regime based on standard ranges of RAI

RAI valuesRainfall regime
≥3 Extremely wet 
2.0–2.99 Very wet 
1.0–1.99 Moderately wet 
0.50–0.99 Slightly wet 
0.49 to −0.49 Near normal 
−0.50 to −0.99 Slightly dry 
−1 to −1.99 Moderately dry 
−2 to −2.99 Very dry 
≤−3 Extremely dry 
RAI valuesRainfall regime
≥3 Extremely wet 
2.0–2.99 Very wet 
1.0–1.99 Moderately wet 
0.50–0.99 Slightly wet 
0.49 to −0.49 Near normal 
−0.50 to −0.99 Slightly dry 
−1 to −1.99 Moderately dry 
−2 to −2.99 Very dry 
≤−3 Extremely dry 

Source: (Van Rooy 1965).

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