Why is it so cold in Hainan?

In abnormal years, the temperature will be relatively low. For example, in 28, Hainan also experienced severe cold weather. In that year, the ice and snow in the mainland were more serious, which greatly affected the traffic and people's production and life. During this period, the temperature was low due to the influence of cold air. But it is certain that this weather will get warmer after some days. Of course, the weather will still change repeatedly. Because,