Why is it easy to rain at low pressure and dry at high pressure?

Low air pressure Because the central air pressure is lower than the surrounding air, the surrounding air flows to the center, and the central air gathers more and more, and the air flow rises. In the process of rising, the temperature drops and water vapor condenses to form precipitation. Under high pressure, the central air flows around, and the central air is less and less, and the upper air flow sinks to supplement it. In the process of sinking, the air temperature rises, and the water vapor is not easy to condense, so it is dry.