What is the reason for the fog in summer?

As long as there is a lot of water vapor in the lower air, when the temperature drops suddenly at night, the water vapor will condense into fog. Most of the fog in summer comes from the warm and humid air current at sea. When it hits the cold ground, the air in the lower layer becomes cold and the water vapor condenses into fog. This fog is called advection fog. It is formed when warm and humid air from the ocean invades the mainland and suddenly encounters cold. When these warm and humid air currents meet the dry and cold air currents in the mainland, it will naturally be rainy. So the fog in spring and summer indicates rainy weather.

As long as there is a lot of water vapor in the lower air, when the temperature drops suddenly at night, the water vapor will condense into fog. Most of the fog in summer comes from the warm and humid air current at sea. When it hits the cold ground, the air in the lower layer becomes cold and the water vapor condenses into fog. This fog is called advection fog. It is formed when warm and humid air from the ocean invades the mainland and suddenly encounters cold. When these warm and humid air currents meet the dry and cold air currents in the mainland, it will naturally be rainy. So the fog in spring and summer indicates rainy weather.