Characteristics and causes of seasonal difference of precipitation in Hainan Island

The precipitation in Hainan Island is concentrated in May -65438+ 10. 165438+ 10-April of the following year is a dry season with little precipitation. Take Haikou as an example. Hainan Island, where Haikou is located, has a typical tropical monsoon climate, with high temperature all year round, annual average temperature of 20℃, heavy annual precipitation and obvious dry season and rainy season. There is less precipitation in the southwest of Hainan Island.

The main reason for the seasonal difference of precipitation in Hainan Island is the influence of monsoon. In summer in the northern hemisphere, the wind belt of the pressure belt moves northward, and the southeast trade wind in the southern hemisphere moves northward, crossing the equator and being deflected by the earth, forming the southwest monsoon. The landing of southwest monsoon brought abundant precipitation. Of course, typhoon landing will also bring precipitation this season. The wind belt of the winter pressure belt in the northern hemisphere moves southward, and Hainan Island is controlled by the northeast monsoon blowing from the mainland, resulting in less water vapor and precipitation, forming a dry season.