Barometric Pressure in Johnston, United States 
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The pressure in Johnston, Iowa, United States is predicted to quickly drop over the next few hours, with an average pressure of 965.2 hPa today, which is lower than normal.
Weather prediction: Expect gale force weather
The daily total fluctuation in pressure in Johnston is 15.3 hPa, with a low of 958.4 hPa and a high of 973.7 hPa.
Forecast
Hourly Pressure Trends
Track the barometric pressure in Johnston hour by hour and stay informed about how it will change over the next 6 hours.
Johnston's weather is influenced by its location in the Midwest, where warm air from the Gulf of Mexico meets cool air from Canada, causing changing air pressure.
The city's geography, with Iowa's flat plains and few obstacles, allows winds to move freely, affecting air pressure and weather patterns.
In the winter, cold air from Canada brings low pressure, resulting in cold and snowy weather, while in the summer, warm air from the Gulf brings high pressure, leading to hot and humid weather.
Johnston has a humid continental climate, which means it experiences large temperature and pressure changes between winter and summer, with a moderate climate overall.