Why is the air pressure high in winter and low in summer? The air pressure in sunny days is higher than that in rainy days.

The air pressure in winter is higher than that in summer because the temperature in winter is lower, the air contracts and the density becomes higher, so the air pressure becomes higher. In layman's terms, when the air gets cold, it contracts together, and of course the air pressure becomes larger.

Under the control of low pressure, the airflow moves upward in the vertical direction, and the airflow is cooled during the rising process (the troposphere temperature decreases with the increase of height), and it is easy to condense and form rainy weather when the airflow is cooled. Controlled by high pressure, the airflow sinks in the vertical direction, and it is not easy to rain when it sinks and expands due to heat, so it is sunny.