Climatic characteristics of southern China.

(1) equatorial monsoon climate. Located in the South China Sea Island area south of north latitude 10 degrees. The annual average temperature is above 26℃, the annual accumulated temperature reaches 9000℃, the temperature changes little, and the rainfall distribution in the four seasons is relatively uniform.

(2) Tropical monsoon climate. Including southern Taiwan Province Province, Leizhou Peninsula and Hainan Island. The annual accumulated temperature is ≥ 8,000℃, the average temperature in Leng Yue is not lower than 16℃, the annual extreme minimum temperature is not lower than 5℃ on average for many years, and the extreme minimum temperature is generally not lower than 5℃, and there is no frost all year round.

(3) Subtropical monsoon climate. It is mainly distributed in the south of Huaihe River in Qinling Mountains in eastern China, and belongs to the tropical monsoon climate type. The average temperature in Leng Yue in winter is around 0℃. Summer is hot, the average temperature in the hottest month is above 22℃, and the temperature changes obviously in seasons with four distinct seasons. The annual precipitation is generally 1, 000 ~ 1, 500mm, which is more in summer, but there is no obvious dry season. Compared with the temperate monsoon climate, the seasonal changes are basically similar, except that the winter temperature is relatively high and the annual precipitation increases. The annual accumulated temperature is 4500℃~ 8000℃, and the average temperature in Leng Yue is -8℃~ 0℃, which is a transitional zone between tropical and temperate zones, and the summer temperature is quite high (average temperature >; =25℃ for at least 6 days, i.e. 30 days).