Barometric Pressure in Jermyn, United States 
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The pressure in Jermyn, Pennsylvania, United States is predicted to drop over the next few hours, with an average pressure of 979.1 hPa today, which is lower than normal.
Weather prediction: Expect wet, unsettled weather and a strong breeze
The daily total fluctuation in pressure in Jermyn is 4 hPa, with a low of 977.4 hPa and a high of 981.4 hPa.
Forecast
Hourly Pressure Trends
Track the barometric pressure in Jermyn hour by hour and stay informed about how it will change over the next 6 hours.
The barometric pressure in Jermyn, Pennsylvania averages 30.12 inches. This is slightly above the national average. Pressure changes slowly throughout the year.
Jermyn is located in a valley. The surrounding mountains are not very high. They still have an impact on the atmospheric pressure. The mountains cause air to move upwards.
As air rises, it cools and expands. This lowers the atmospheric pressure. In the winter, cold air is dense and heavy. It sinks to the valley floor.
This cold air increases the atmospheric pressure in Jermyn. In the summer, warm air is light and rises. This decreases the atmospheric pressure. The valley landscape affects the pressure.