Why is it cloudy in winter?

In winter, the temperature is often very high in rainy days, but when the sun comes out, it is very low and cold. Reasons: When it rains in winter, there are more clouds in the air and the height of the clouds is lower, which can strongly absorb ground radiation, enhance atmospheric inverse radiation, play a good role in heat preservation, and make people feel warmer; On sunny days, there are few clouds in the sky, which absorbs less ground radiation, weakens atmospheric inverse radiation and has poor heat preservation effect. Due to a large amount of geothermal loss, the temperature is low and people feel cold. In winter, the invasion of warm and humid airflow in the southeast or southwest is weak. Even in low latitudes, the temperature in winter will be higher than that in high latitudes. Before the arrival of the cold front, the sunny days were warmer, and after the cold front passed, the sunny days were colder.