Is Nantong colder than Xuzhou in winter?

Yes, winter in Nantong is relatively colder than that in Xuzhou.

Geographically speaking, Xuzhou belongs to the northern region, close to Shandong and inland. The air is dry, cold in winter, and dry and cold. Nantong region belongs to the southern region, and geographically it is also the place where rivers and seas meet. The air is humid, and the wind on the river and sea transports water vapor to the ground. The cold in winter is wet and cold, and the chill drills into the bone marrow. In the coldest winter, you can't sit still without turning on the air conditioner.