Is the air pressure higher or lower on a sunny day than on a cloudy day? why

The air pressure on sunny days is higher than that on cloudy days.

Because rainy weather will form a low-pressure circulation, the wind direction changes obviously; Under the situation of high pressure circulation, it is mostly sunny and the weather is relatively stable. Therefore, areas with high ground pressure are often sunny, and areas with low ground pressure are often rainy.

The high pressure and low pressure mentioned here are relative, not the absolute value of atmospheric pressure. The air pressure in a certain area is higher than the surrounding air pressure, which is called high pressure area; The air pressure in a certain area is lower than the surrounding air pressure, which is called low pressure area.

Extended data

In addition to the weather, air pressure is also related to other factors:

1, air pressure is related to altitude, atmospheric temperature, atmospheric density, etc. Generally, it decreases exponentially with altitude.

The air pressure changes every day and every year. In a year, the air pressure in winter is higher than that in summer. In a day, the air pressure has a maximum value and a minimum value, which appear at 9 ~ 10 and 15 ~ 16 respectively, and the second high value and the second low value appear at 2 1 ~ 22 and 3 ~ 4 respectively.

3. The change of air pressure is closely related to wind and weather, so it is an important meteorological factor.

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