Why is it cool when the sun just rises, but it is hot at noon?

The lowest temperature in a day is around sunrise, and the highest temperature is around 2 pm. Because after the sun went down, both the air and the ground lost the supply of sunlight and heat at the same time, so they began to lose heat and the temperature dropped continuously. By the next morning, the ground temperature had dropped to its lowest point. After sunrise, the ground directly absorbs the sun's heat, which makes the temperature rise gradually. So the temperature is usually the lowest before sunrise. This is caused by the change of surface temperature and the heat insulation of the atmosphere. First, the sun is the direct heat source of the earth. Solar radiation absorbs heat from the surface, and the heated surface transfers heat to the atmosphere through long-wave radiation. The atmosphere transmits heat back to the surface, which insulates the surface. This is the thermal insulation of the atmosphere. Secondly, before and after sunrise, due to the continuous heat release at night, the solar radiation heating is insufficient, and the surface temperature continues to drop. Only after sunrise can the temperature rise again by receiving solar radiation, so the temperature is the lowest before and after sunrise. Finally, due to the continuous heat release, the atmosphere can not be heated, and the heat preservation function is gradually weakened, so the surface temperature reaches the lowest before and after sunrise.