Why can the rain at night moisten the ground better than the weather at night?

It rains at night because it moistens the ground better than the weather at night, and because the atmosphere absorbs the radiation from the ground and plays a role in warming up and storing heat. Water vapor and carbon dioxide in the troposphere have poor absorption capacity for short-wave solar radiation, but strong absorption capacity for long-wave ground radiation. It is observed that 75% to 95% of the ground radiation is absorbed by the atmosphere 40 to 50 meters thick near the ground, which warms the atmosphere near the ground.

Brief introduction to the above problems

Compared with sunny days, cloudy days have a thicker atmosphere, and the stronger the weakening effect on solar radiation, the less the total amount of solar radiation received by the ground and the lower the temperature.

You should know here that cloudy days and sunny days are generally the brightness of the sky. My understanding is that the thickness of the atmosphere weakens solar radiation. As for why the cloudy atmosphere is thicker, because there are more particles such as water vapor and dust, why are there more water vapor and dust? Specific analysis of the specific situation.

Strong heat preservation function in the topic does not mean high temperature, because the comparison objects are different. For heat insulation, it is meaningful to change the thickness of the atmosphere under the condition of constant total solar radiation. For temperature, the total solar radiation is set as a variable, so the comparison is meaningful. Therefore, under the background of the topic, strong heat preservation effect and low temperature are contradictory, which is easy to explain.