When the sky is cloudy in summer, the temperature will not be too high during the day. Cloudy nights are usually warmer than sunny nights. Why?

Mainly investigate the role of the atmosphere. During the day, the atmosphere plays a role in weakening solar radiation. With the increase of atmospheric concentration on cloudy days, the atmosphere of solar radiation is weakened and enhanced, and the solar radiation reaching the ground is reduced, so the temperature on cloudy days is lower than that on sunny days. At night, the atmospheric concentration increases, the atmospheric inverse radiation is enhanced, and the thermal insulation effect of the ground atmosphere is enhanced, so the cloudy night is warmer than the sunny night.