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Climate in Hainan

Hainan, separated by the Qiongzhou Strait (琼州海峡) from the Leizhou Peninsula (雷州半岛) of Guangdong, is the largest island administered by the People's Republic of China. The size of Hainan is comparable to the size of Belgium. The PRC, however, regard it as the second largest island, since Taiwan is considered the largest. To the west of Hainan is the Gulf of Tonkin. Wuzhi Mountain (1,876 m) is the highest mountain on the island.

Hainan has a tropical moist monsoonal climate. Its annual temperature change is less than 15 degrees Celsius. The coldest months are January and February when the temperatures drop to 16 to 21 degrees Celsius; the hottest months are July and August, and the temperatures are 25 to 29 degrees Celsius. Except for the mountainous regions in the central part of the island, the daily average temperature in Hainan is above 10 degrees Celsius, and the integrated temperature during the growing season of the crops reaches eight thousand to nine thousand degree Celsius-days. The summer in the north is hot and, for more than 20 days in a year, the temperature can be higher than 35 degrees Celsius. The average annual precipitation is 1500 to 2000 mm and can be as high as 2400 mm in central and eastern areas, and as low as 900 mm in the coastal areas of the southwest. The eastern part of Hainan lies in the path of typhoons, and 70% of the annual precipitation is derived from typhoons and the summer rainy season. Major flooding occurs due to the typhoons and they can cause many problems for the local residents.

The city of Haikou is on the northern edge of the torrid zone, and is part of the monsoon tropical zone. April to October is the active period for tropical storms and typhoons; most occur between August and September. May to October is the rainy season with most rainfall coming in September. Annual Average temperature is 17-23°C .

Sanya is roughly on the same latitude as Hawaii, with very warm weather all year around. It is one of the transportation and communication centers of China, and one of the important trade ports in the extreme south of the golden coastline. The daily average temperature is 25.4 °C and annual rainfall is 1,279 mm.

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