A significant snowstorm swept through the D.C. area on Monday, bringing 6-12 inches of snowfall to the region. The storm began on Sunday night and continued until Monday evening, with the heaviest snowfall occurring during the predawn hours.
According to Reagan National Airport, which serves as the District’s official observation site, the storm resulted in a total of 7.2 inches of snowfall. Washington Dulles International Airport recorded 5.1 inches, while Baltimore-Washington International Marshall Airport set a calendar-day record with 6.6 inches.
The storm’s intensity varied across the region, with accumulation values ranging from 6-8 inches inside the District and up to 9-12 inches in certain areas of Northern Virginia and Maryland’s Eastern Shore. The snowfall was caused by a unique combination of atmospheric factors, including moist air from the Gulf of Mexico and frigid Arctic air from Canada.
Forecasters had predicted widespread double-digit snow totals, but the actual totals were slightly lower due to some forecast models’ inaccurate predictions. Despite this, the storm brought significant amounts of snow to the region, exceeding previous January averages and setting new records for some areas. This is the fifth Washington top-six snowstorm since 2016, with most occurring in January.
Source: https://www.washingtonpost.com/weather/2025/01/07/dc-region-snow-totals-winter-storm