What is the lowest temperature in Shantou, Guangzhou in winter?

The lowest temperature in winter in Guangzhou can drop to about 8 degrees when cold air comes, and the temperature in winter is usually around 10- 16 degrees. The same is true of Shantou, which is not much different from Guangzhou. In winter, you can usually wear only a long-sleeved underwear and a thin coat. Unless it is cold air, it is almost enough to wear an extra coat.