Barometric Pressure in Mason City, Iowa, US
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The pressure in Mason City, United States 
is predicted to quickly drop over the next few hours, with an average pressure of 981.5 hPa today, which is lower than normal.
Weather prediction: Expect gale force weather
The daily total fluctuation in pressure in Mason City is 11.9 hPa, with a low of 973.1 hPa and a high of 985 hPa. The daily average here is lower than in most cities around the world.
Forecast
The barometric pressure in Mason City, Iowa averages around 30.12 inches. This is slightly above the national average. It fluctuates throughout the year.
In winter, the pressure is usually higher, around 30.20 inches. This is due to cold air from Canada. In summer, the pressure is lower, around 30.05 inches. This is due to warm air from the Gulf of Mexico.
Mason City is situated in a flat to gently rolling prairie landscape. The city is surrounded by farmland and forests. This flat terrain allows air masses to move freely.
The nearby Winnebago River has a minimal impact on the local pressure. The river's effect is mostly felt in terms of humidity. Moist air from the river can lead to increased precipitation.