Why is it high pressure and sunny weather?

Because when controlling the high pressure, the near-surface temperature is low, and the air sinks (hence the name high pressure), of course, the water in the air sinks, because the near-surface temperature is high, and the air can hold more water. At this time, the sky is cloudless, so it is sunny. On the contrary, when the air pressure is low, the temperature near the ground is high, the air rises, and the moisture also rises. When the air temperature is low, water vapor condenses into water droplets, which can form precipitation. Look!