What is the relationship between temperature and ground temperature? What's the difference?

The temperature reported in the weather forecast is the air temperature. After the heat energy of the sun is absorbed by the ground, the ground transfers the heat to the air through radiation, conduction and convection, which is the main source of heat in the air. The part of solar radiation directly absorbed by the atmosphere has little effect on heating air, and can only increase the temperature by 0.0 15 ~ 0.02℃. It is also for this reason that the ground temperature is generally higher than the air temperature.

Factors affecting surface temperature

There are many factors that affect the change of surface temperature, such as surface humidity, temperature, light intensity, surface materials (such as lawn or bare land, cement floor or asphalt floor) and so on. For an area, the surface temperature of the area mainly depends on the latitude of the area (such as the temperature difference between the area on the equatorial line of the Arctic and the Arctic Ocean), as well as the altitude difference, population density, industry and so on.