How to judge the change of weather according to the change of air pressure?

Generally speaking, in the frontal weather system, the pressure from low to high is the precipitation in front of the front, and the temperature drops to a cold front after the front passes; From high pressure to low pressure, it is precipitation behind the front, and the temperature rises after the front crosses the border, which is a warm front.

In the earth's atmospheric circulation, the low air pressure is due to the expansion of air flow or the rise of power, usually rainy weather; High air pressure is due to air contraction or power drop, usually in dry weather.