Table 2: Descriptive statistics for monthly total rainfall from 1961 to 2010 (unit: mm).

Jan.Feb.Mar.Apr.MayJune

Maximum70.0050.0073.5087.9090.60123.3
Minimum1.005.003.303.806.300.1
Mean35.1925.1430.0732.2039.7446.28
Standard deviation17.0711.3816.2518.8620.4626.82
Variation coefficient0.490.450.540.590.510.58

JulyAug.Sep.Oct.Nov.Dec.

Maximum147.60189.90161.90106.3095.00106.00
Minimum7.405.707.304.5017.004.80
Mean51.1558.3349.2045.9045.7340.80
Standard deviation30.7639.9731.4824.2619.6519.03
Variation coefficient0.600.690.640.530.430.47