What is the surface temperature at 40 degrees?

The temperature is 40 degrees, and the surface temperature is 70 degrees. The surface temperature is the temperature of the ground. After the heat energy of the sun radiates to the ground, part of it is reflected and part of it is absorbed by the ground, which makes the ground warm. The temperature obtained after measuring the ground temperature is the ground temperature. The surface temperature will also change according to the location environment.

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 under normal circumstances, the surface temperature will be higher than the air temperature.