Barometric Pressure in Harrisburg, United States

• Forecast Chart
• Hourly Trends

The pressure in Harrisburg, Illinois, United States is predicted rising over the next 24 hours, with an average pressure of

1012

today, which is considered normal.

Weather prediction: Fairly fine, possible showers early

The daily total fluctuation in pressure in Harrisburg is

0.7

, with a low of

1011.6

and a high of

1012.3

.

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Forecast

Harrisburg has a humid climate with four clear seasons. Summers are usually hot and sticky, with many thunderstorms. Winters are cold, but heavy snow is not common every year. Spring and fall bring milder temperatures and quick changes in weather. Rain can fall during any season.

Air pressure patterns often control the weather. Low pressure systems moving from the west can bring clouds, strong winds, thunderstorms, and sometimes tornadoes. High pressure usually brings clearer skies and calmer, drier weather. Cold fronts can cause a fast drop in temperature, especially in spring and fall.

Harrisburg is in southern Illinois, far from large mountains and oceans. This lets cold air from Canada and warm, moist air from the Gulf of Mexico move into the area. The nearby Shawnee Hills can slightly affect winds, clouds, and rainfall. The town's inland location also causes larger changes between summer heat and winter cold.