Flexi Says: Atmospheric pressure is affected by many factors related to daily changes in weather, including temperature and humidity. In any one location, atmospheric pressure changes frequently. Knowing the exact atmospheric pressure in a precise location can be useful for certain applications, such as local weather prediction. However, in many cases it is more useful to know the average atmospheric pressure in a region. For example, average atmospheric pressure can be used to analyze global patterns related to elevation, climate zones, and the movement of air masses.