The winter half of the year (October to March) is mainly controlled by the northerly monsoon, and the summer half of the year (April to September) is mainly affected by tropical high pressure, strong winds and southerly winds. Autumn and spring are connected, long summer without winter, summer without intense heat, and the climate is pleasant. The wind direction distribution in the North Sea has typical monsoon characteristics. Southerly winds prevail in the summer half of the year, and northerly winds prevail in the winter half of the year.
April and September are the alternating periods of winter and summer monsoons. In April, the winter monsoon changes to the summer monsoon, and the maximum wind direction transitions from north to south; in September, the summer monsoon changes to winter monsoon, and the maximum wind direction gradually changes from south to north. In normal years, northerly winds prevail from October to March, and southerly winds prevail from April to September.
Extended information:
The surface water system in Beihai urban area is underdeveloped, and the streams are short and seasonal. The largest river, the Sanhekou River, flows from north to south through Niuweiling to Daguansha and enters the sea. The Niuweiling Reservoir is built in the upper reaches of the Sanhekou River, with an effective storage capacity of 11.3 million cubic meters. In addition, there are small reservoirs such as Longtou River, Hougou River, Qixing River, and Liyudi.
The Huhai Canal is an artificial channel on the Beihai Peninsula. The canal water comes from the Hepu Reservoir. From March to October every year, water is released from the Hepu Liuhu Reservoir into the Beihai Peninsula for irrigation. There are no rivers flowing all year round on Weizhou Island. There are temporary streams during the rainy season.
A small reservoir was built using a gully in the west corner of the island. Beihai City is rich in groundwater resources and is the only fresh water source for urban water supply in the near future. Its type is mainly loose rock pore water, followed by cave fissure water.
Baidu Encyclopedia-Beihai