Why is the temperature the lowest around sunrise?

The atmosphere mainly loses heat in the form of inverse radiation and atmospheric radiation, and there is no solar radiation to supplement heat until sunrise the next day, so the temperature reaches the lowest value around sunrise the next day.

The hot and cold weather is mainly determined by the temperature, and the fundamental factor affecting the temperature is the intensity of solar radiation. Solar photothermal is not the main reason for the direct temperature rise. The direct absorption of solar heat energy by air is only about 14%, while 43% of the energy in the visible region is absorbed by the ground. When the ground absorbs solar radiation heat, it is conducted into the air through radiation, convection and other forms, which is the main reason for the temperature rise.

After noon, solar radiation began to weaken, but the ground still absorbed more heat than it consumed. Until about 1 in the afternoon, the ground temperature reached the highest and the ground radiation reached the strongest. Because it takes a certain time for heat to transfer from the ground to the atmosphere, the temperature near the ground reaches the highest at about 2 pm, and the atmospheric reverse radiation also reaches the maximum in a day.