Which is the coldest winter in Xiamen, Fuzhou and Quanzhou?

Compared with Fuzhou, Xiamen, Fuzhou and Quanzhou have the coldest winters. Xiamen, Fuzhou and Quanzhou are geographically located in the north of Fuzhou, where the cold air is fiercer and colder. Quanzhou and Xiamen are in the south, with weak cold air and slightly higher temperature than Fuzhou. Of course, it is cold in winter in Fuzhou mountainous area. Quanzhou and Xiamen are coastal areas, and the temperature of seawater can be adjusted. When the earth turns on, the heating at sea will be adjusted. When the land is hot, the hot air will not be adjusted to the sea.