The main factor affecting temperature is determined by the intensity of solar radiation. However, solar heat is not the main reason for the direct temperature rise. Only about 14% of heat energy is directly absorbed by air from sunlight, while about 43% is absorbed by the ground. When the ground absorbs the radiant heat of the sun and conducts it to the air through radiation and convection, this is the main reason for the temperature rise. The sun shines on the ground to make it hot, and the heat absorbed by the ground is released to heat the air, so it takes some time for the temperature of the ground to rise after being heated. After noon, when the heat released from the ground is still less than the heat provided by the sun, the ground temperature will not rise to the highest until 2 or 3 pm.
One afternoon, the highest temperature is at two or three o'clock in the afternoon and the lowest temperature is in the early morning. Because the hot and cold weather mainly depends on the temperature, and the main factor affecting the temperature is determined by the intensity of solar radiation. When the sun absorbs radiant heat from the sun, it is transferred to the air through radiation and convection, which is the main reason for the temperature rise. After noon, the heat released by the ground is less than the heat provided by the sun, and the ground temperature will not rise to the highest until two or three in the afternoon.
The heat source on the earth is solar radiation. The sun transfers heat to the ground through solar radiation, and the ground transfers heat to the atmosphere through ground radiation. The main heat source of the atmosphere is the ground, and the atmosphere absorbs little heat from solar radiation. Usually we directly feel the atmospheric temperature near the ground, not the surface temperature. The weather forecast also predicts the temperature, that is, the temperature.
At noon 12, the solar altitude angle is the largest and the solar radiation is the strongest, but it takes a process for the ground to receive heat and another process for the ground to transfer heat to the atmosphere through ground radiation, so the temperature is the highest at 2 pm.
After sunset, there was no solar radiation, and the ground lost its heat source, but it was still releasing heat. The atmosphere can only play a certain role in heat preservation. Some of the heat emitted from the ground will return to the ground through the reverse radiation of the atmosphere, but some heat will still be lost. Throughout the night, the ground only releases heat, not supplements it. As the temperature gradually decreases, the temperature of the near-surface atmosphere also decreases. It was not until sunrise that the surface and near-surface atmosphere began to replenish heat, so the temperature was the lowest around sunrise.