Variation of air pressure from Sichuan to North China

The above answer is absolutely wrong. The normal air pressure is about 1000 hectopascals, and the center of a strong typhoon will not reach more than 700 hectopascals even if it belongs to ultra-low air pressure. In terms of order of magnitude, the previous answer is also wrong.

Air pressure is the weight of the air column from the ground to the top of the atmosphere. If there is no disastrous weather process (such as the outbreak of cold wave) and the whole day is calm, then the air pressure is related to the temperature. The lower the temperature, the higher the air pressure and the lower the air pressure (according to the temperature-pressure equation). The temperature is the lowest at 5-6 am and the highest at around 2 pm every day, so the air pressure should be opposite.

This is a universal law, regardless of the region, and it is also applicable in Sichuan!

The atmospheric pressure mentioned above refers to the ground pressure.