Why is the air pressure higher in winter than in summer?

When air expands when heated and its density becomes smaller, the weight of air column per unit area decreases, so the air pressure decreases. On the contrary, the air pressure rises. Air is a substance, and most substances have the characteristics of thermal expansion and cold contraction, and air is no exception, so the air pressure in winter is higher than that in summer. The seasons in the northern and southern hemispheres of the earth are opposite. The air that expands in the summer hemisphere is just replenished in the winter hemisphere.

When air expands when heated and its density becomes smaller, the weight of air column per unit area decreases, so the air pressure decreases. On the contrary, the air pressure rises. Air is a substance, and most substances have the characteristics of thermal expansion and cold contraction, and air is no exception, so the air pressure in winter is higher than that in summer. The seasons in the northern and southern hemispheres of the earth are opposite. The air that expands in the summer hemisphere is just replenished in the winter hemisphere.