Barometric Pressure
Barometric Pressure in O'Fallon, United States 
0000 hPa
00.0 ℃
00.0%
00.0 m/s
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Forecast
Hourly Pressure Trends
Track the barometric pressure in O'Fallon hour by hour and stay informed about how it will change over the next 6 hours.
Upcoming Days
Stay informed about the barometric pressure trends in O'Fallon for the upcoming days, including daily minimum and maximum readings.
O'Fallon's air pressure changes with weather. Low pressure brings rain and storms, while high pressure brings clear skies. Its location in the Midwest, near mountains, affects air pressure. Air from the west coast rises over mountains, cools, and loses moisture before reaching O'Fallon. In spring and summer, low pressure dominates, bringing thunderstorms. In fall and winter, high pressure prevails, bringing cold but clear weather. O'Fallon has a humid continental climate with big pressure changes between seasons. This climate brings cold winters with low pressure and warm summers with high pressure. Weather fronts from Canada and the Gulf of Mexico meet in O'Fallon, changing air pressure. Pressure changes cause different weather, like storms or clear skies.