In winter, in coastal cities, cold has two decisive factors:

1, wind power. As the saying goes, in the cold wind, in the poor debt. Explain that wind is a factor.

2. Latitude. The coastal city, its geographical location, determines everything.

Sanya on Hainan Island is located in the tropics. Even in winter, there is no cold feeling.

Therefore, "it's cold, go south; It's hot, go north. "