How many degrees is wet cold equivalent to dry cold?

According to the somatosensory temperature formula of the Central Meteorological Observatory, when the temperature is 5℃, the relative humidity reaches 70% and the somatosensory temperature is 2.6℃. If the relative humidity reaches 90%, the somatosensory temperature is only 65438 0.2℃. In the north, the temperature is 5℃, and the somatosensory temperature is 2.5℃ when the gale of magnitude 7 blows, and it will reach 1.8℃ when the gale of magnitude 9 is superimposed.

It is common for the air humidity in the south to reach over 70% in winter, but it is not so easy to maintain a strong wind of 7-9 in the north, so the humidity in the south is better under the same temperature conditions.

It is worth noting that if the "same temperature condition" is not considered, the temperature is the most important factor affecting the somatosensory temperature when the temperature difference is too large. Taking Beijing and Shanghai as examples, the average temperature in the coldest month of 1 is -3℃ and 4.5℃ respectively. Considering the wind and relative humidity, the somatosensory temperatures in Beijing and Shanghai are -3.6℃ and 2. 1℃ respectively.

Related information:

First, the causes of wet and cold

The wetter the air, the greater its thermal conductivity. In winter, the greater the relative humidity of the air, the easier it is for the human body to dissipate heat, and the colder it will feel. Because the thermal conductivity of water is relatively large, humid air is more conducive to heat conduction, so people will feel that wet cold is much colder than dry cold.

Generally speaking, China is dry in the north and humid in the south, so there is a big gap between the cold degree perceived by human body and the temperature in the north and south. Many people think that winter in the south is colder than winter in the north. Some netizens joked that "dry and cold in the north is a physical attack, and you can easily defend yourself by wearing more clothes; The wet cold in the south is a magical invasion. It's no use wearing more clothes. You have to be resistant! "

Second, the harm of wet and cold

The wet and cold weather in the south is prone to freezing rain, and the infrastructure used in the south is basically not suitable for use in freezing rain. After freezing rain, it is easy to cause snow and ice, which is harmful to industrial and agricultural production such as wired communication and power transmission (power lines and telephone lines), transportation, fruit trees and crops.