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Table 2

Monthly rainfall distributions for Al-Baha (mm)

MonthDistributionAverageCV (%)Skewness
January Gamma (0.70, 11.69) 8.36 119.8 2.38 
February Gamma (0.70, 8.96) 6.29 120.1 2.56 
March Gamma (0.72, 17.2, 0.29) 12.78 115.1 2.59 
April LN (2.71, 0.93, 0) 23.22 117.4 5.0 
May Gamma (0.82, 12.47) 10.11 110.0 2.12 
June Gamma (0.85, 3.13) 2.67 108.0 2.23 
July W (0.76, 1.71, 0.002) 2.04 135.7 3.27 
August LN (0.26, 1.65, 0.02) 5.48 386.8 23.0 
September LN (-1.36, 1.21, 0.01) 0.54 181.2 7.22 
October LN (-0.016, 1.79) 5.04 448.1 24.7 
November Gamma (0.71, 5.77) 4.1 119.1 2.38 
December Gamma (0.80,6.06) 4.85 113.2 2.23 
MonthDistributionAverageCV (%)Skewness
January Gamma (0.70, 11.69) 8.36 119.8 2.38 
February Gamma (0.70, 8.96) 6.29 120.1 2.56 
March Gamma (0.72, 17.2, 0.29) 12.78 115.1 2.59 
April LN (2.71, 0.93, 0) 23.22 117.4 5.0 
May Gamma (0.82, 12.47) 10.11 110.0 2.12 
June Gamma (0.85, 3.13) 2.67 108.0 2.23 
July W (0.76, 1.71, 0.002) 2.04 135.7 3.27 
August LN (0.26, 1.65, 0.02) 5.48 386.8 23.0 
September LN (-1.36, 1.21, 0.01) 0.54 181.2 7.22 
October LN (-0.016, 1.79) 5.04 448.1 24.7 
November Gamma (0.71, 5.77) 4.1 119.1 2.38 
December Gamma (0.80,6.06) 4.85 113.2 2.23 

W: Weibull; LN: LogNormal; Gamma [1st parameter = shape factor, 2nd parameter = location; 3rd parameter: threshold value].

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