What are the climatic characteristics of Hainan in winter?

The winter climate in Hainan is characterized by no severe cold in winter and low temperature all year round. Hainan Island is located in the northern edge of the tropics and belongs to the tropical monsoon climate. It has always been known as a "natural greenhouse". It has a long summer and no winter. The annual average temperature is 22~27℃, and the accumulated temperature of 10℃ is 8200℃. The coldest January temperature is still 17 ~ 24℃, and the annual illuminance is 1750. Hainan Province, referred to as "Qiong" for short, is the southernmost provincial administrative region in People's Republic of China (PRC), with Haikou as its capital. It is a special economic zone and a free trade pilot zone in China.

Hainan Province is located at the southernmost tip of China, bounded by Qiongzhou Strait in the north, facing Vietnam across the sea in the Beibu Gulf in the west, facing Taiwan Province Province in the South China Sea in the east, and bordering the Philippines, Brunei and Malaysia in the South China Sea in the southeast and south.

In spatial distribution, the geological structure of Hainan Island has formed a main structural system with various directions, tracks and properties, such as east-west, north-south, northeast and northwest, which has become the main structural pattern of the land and controlled the recent island-land sedimentary construction, magmatic activity, mineralization and the distribution of mountains and rivers.

There are four structural zones in the east-west direction from north to south, and folds and faults in the northeast direction are well developed, which can be divided into two groups in spatial distribution: northeast and northeast. The deep geological structure of Hainan Island is a depression area under the background of mantle uplift. The center of mantle depression is from Qiongzhong to Ledong, and the depth of mantle depression is more than 30 kilometers. Due to the differences in crustal structure and deep structure, the island has many different characteristics in geological structure, sedimentary formation and magmatic activity.