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Table 3

Monthly rainfall distributions for Jazan (mm)

MonthDistributionAverageCV (%)Skewness
January Gamma (0.99, 18.12) 17.6 103.3 2.13 
February Gamma (1.0, 10.22) 10.2 98.8 1.93 
March Gamma (0.69, 18.27, 0.44) 12.9 116.5 2.29 
April W (0.98, 28.11) 28.5 101.5 1.95 
May W (1.11, 21.96,0) 21.3 92.6 1.81 
June LN (2.67, 0.7, 0) 18.7 79.0 2.71 
July LN (2.90, 1.26) 39.2 183.1 7.79 
August LN (3.71, 0.68,0) 51.7 77.7 2.86 
September LN (3.23, 0.65,0) 31.2 72.2 2.34 
October W (1.25, 21.17) 19.7 79.8 1.32 
November W (1.21, 25.11, 0) 23.4 82.1 1.45 
December LN (2.78, 0.96) 25.6 117.9 3.73 
MonthDistributionAverageCV (%)Skewness
January Gamma (0.99, 18.12) 17.6 103.3 2.13 
February Gamma (1.0, 10.22) 10.2 98.8 1.93 
March Gamma (0.69, 18.27, 0.44) 12.9 116.5 2.29 
April W (0.98, 28.11) 28.5 101.5 1.95 
May W (1.11, 21.96,0) 21.3 92.6 1.81 
June LN (2.67, 0.7, 0) 18.7 79.0 2.71 
July LN (2.90, 1.26) 39.2 183.1 7.79 
August LN (3.71, 0.68,0) 51.7 77.7 2.86 
September LN (3.23, 0.65,0) 31.2 72.2 2.34 
October W (1.25, 21.17) 19.7 79.8 1.32 
November W (1.21, 25.11, 0) 23.4 82.1 1.45 
December LN (2.78, 0.96) 25.6 117.9 3.73 

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

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