Barometric Pressure in Washington D.C., United States

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Forecast

Washington, D.C. has four changing seasons. Summers are hot and humid, with frequent thunderstorms. Winters are cool, and snowfall varies from year to year. Spring and fall often bring mild temperatures, but weather can change quickly. Rain falls throughout the year.

Air pressure systems help control these changes. Low pressure often brings clouds, rain, strong winds, or snow. High pressure usually brings calmer and drier weather. Cold air can move down from Canada, while warm, moist air can move north from the Gulf of Mexico and Atlantic Ocean. These air masses often meet near the region, creating changing weather and storms.

The Potomac and Anacostia rivers, along with the nearby Chesapeake Bay, add moisture to the air and slightly soften winter temperatures. The city’s inland location still allows cold air to arrive easily. Buildings and paved streets can make the city warmer than nearby rural areas, especially at night.

The local climate is humid and has warm summers and cool winters. Summer heat can feel stronger because of high humidity. Winter storms may bring rain, snow, or ice, depending on the temperature. Large storms called nor’easters can sometimes bring heavy snow, strong winds, and coastal flooding.