In fact, why shanghai winter feels colder than minus several degrees or even minus ten degrees in the north, there is an easy to understand metaphor.
Shanghai is wet and cold, the north is dry and cold, for example, you just took a bath in winter, the faucet turned off the whole body wet and did not wipe that will be the coldest, after drying it is not so cold.
These days the temperature is 6 or 7 degrees, but the humidity is 70% to 90%, not dried, cold.