Why is there a difference between the real-time temperature shown in the weather forecast and the human body temperature?

The difference between the real-time temperature shown in the weather forecast and the human body temperature is because the human body temperature takes into account factors such as temperature, humidity and wind speed.

Somatosensory temperature refers to people's comfortable feeling. It is a kind of feeling that people get physically or psychologically when they contact with the external environment through their own sensory organs, especially the skin. It is the temperature of the surrounding environment that the human body feels. People's somatosensory temperature is often different from the actual temperature. Because the somatosensory temperature is not only affected by temperature, but also by humidity, wind, radiation, dress color, mood and other meteorological factors, which is different from the real-time temperature of the actual environment. But the real-time temperature actually refers to the temperature of the gas in the atmosphere, and it can't completely and accurately express the human body's feelings about the cold and warm environment. Somatosensory temperature is an important index for human body to adjust heat balance, and actual temperature is an important index that affects somatosensory temperature.

Relative humidity is one of the important meteorological factors affecting the somatosensory temperature. At the same temperature, the greater the relative humidity, the more obvious the increase of somatosensory temperature. For example, it is also 30 degrees. When the relative humidity is only 50%, the somatosensory temperature reaches 3 1 degree. When the relative humidity reaches 90%, the somatosensory temperature will soar to 40 degrees, which is 10 degrees higher than the meteorological temperature. Usually, the temperature is relatively high and the humidity is relatively low, so the human body will not feel uncomfortable, because the water on the surface of the human body has evaporated and it feels very dry. Wind speed will also affect people's somatosensory temperature. A certain wind speed will make people feel that the air is flowing and the heat emitted by the body is blown away from the body surface. Even if the temperature is high, it will still feel dry, which is why in some areas of the north and south, although the temperature is equal, the body feels completely different.

Radiation is also a factor that affects the human body's temperature. When the sun shines directly on people, their body temperature will rise. If it is in the shade of a tree or under an awning, it feels completely different from direct sunlight. Generally, the difference in somatosensory temperature between cloudy and sunny days is 4 degrees to 6 degrees, or even greater. The same is true of surface radiation. The surface temperature is high, and the heat emitted to the outside is large. For example, the temperature of the concrete floor in the sun is quite different from that of a cooler water body or wetland. Because the heat absorbed by air will be affected by relative humidity and its density; However, the wind speed will affect the air composition that can come into contact with the human body surface. When the wind speed increases, the air that comes into contact with the human body will increase, so the heat it takes away or brings will also increase accordingly. Therefore, the human body temperature in the weather forecast will take these factors into account, thus deviating from the real-time temperature.