本区降水具有日、年周期变化和年际间的准周期变化，以及高度效应、距离效应（经、纬度效应）的特征。年雨量在东西向上成大小相间的多重排列（与地面海拔相似）；中心地段比其两侧雨量少得多、雨季开始晚且短；雨量、云量、相对湿度、日照时数等年值之间有一定的相关关系和大体上相同的空间分布规律。

For precipitation in this region, there are distinct variational characters of daily, annual periodic change, and guasi-periodic oscillation of precipitation of year to year, and elevation effect and distence effect (longitzdainal and latitudinal effect). The annual rainfall amounts arrange multiple in big alternatiny with small in east-west direction (similar to the elevation of ground surface). The precipitation is less, the beginning day and the period of rain season is latter and shortter in the middle of this region than in two side of its. There are fixed correlation ralations of the annual values between the precipitation and total cloud cover, relative humidity and sunshine duration, and so on, more and less alike distributive law of space.