Which is higher between sunny weather pressure and cloudy weather pressure?

High pressure on sunny days. Under normal circumstances, the ground continuously radiates long-wavelength effective radiation to the atmosphere, and the atmosphere also continuously radiates reverse radiation to the ground. On a clear day, the heat on the ground can be transported outwards relatively smoothly through effective radiation and the upward divergent movement of the troposphere. On cloudy days, clouds reduce the outward divergent movement of the tropospheric atmosphere. The effect of clouds on conserving heat from the earth's surface and the liquid layer is called the "greenhouse effect." In this way, the atmosphere in cloudy areas expands more strongly, which causes the atmosphere in cloudy areas to spread laterally outward, reducing the density of the air. At the same time, the humidity of the atmosphere in cloudy areas is relatively high, which also reduces the density of the atmosphere. Due to the influence of these two factors, the atmospheric pressure on a cloudy day is lower than that on a sunny day.