Why is the temperature not very high on cloudy days and not very low at night? On the heat preservation function of atmosphere.

Because during the day, due to the reflection of solar radiation by clouds, some energy can't reach the ground, resulting in low temperature. At night, the heat accumulated on the ground is released into the air in the form of infrared rays, and some of it is reflected back to the ground by clouds, so that the temperature will not drop very low on cloudy nights. Clouds can reflect some infrared rays and have a certain heat preservation effect. At night, when the concentration of carbon dioxide is high, the greenhouse effect is obvious, and the temperature will not drop too low on cloudy nights. Thank you.