Why is it humid in winter in the south?

Winter in the south is humid, and the water content in the air is high, that is, the humidity is high. The same temperature is much colder than the dry weather in the north. So many northerners feel colder when they go to the south, although the temperature is higher than that in the north.

If the air humidity in the south is high, the situation of "saturated water" in the air is "serious", so when the human body radiates heat, the body has no way or reduces its ability to evaporate heat, so it feels "sultry". Because water evaporation needs to absorb heat, and if the humidity in the air is high in winter, it needs to "take away" more heat to evaporate water, so that the human body will feel "wet cold" or "cold".