Excuse me, why is it sunny under high pressure control? Isn't high air pressure on the ground just a rising air flow and a lot of precipitation?

When the near ground is controlled by high pressure, the local air mass is bound to be in the process of contraction (contraction makes the air density increase, which in turn forms high pressure), so the vertical air flow is bound to sink (the sinking process is the contraction process). Every time the air drops 100 meter, the temperature will rise by 0.6 degrees, making it difficult to form precipitation (only when the temperature drops can it become a cloud and cause rainfall).

Therefore, when the near surface is controlled by high pressure, downward flow is dominant and the weather is fine.