Washington DC Snowfall Totals & Accumulation Averages
This page pulls together information on when, how much and how often Washington DC has snow.
There are data and descriptions here of how many days it snows and the total amount of snowfall that Washington usually gets. There are also monthly and yearly counts of the days that the nation's capital city normally has heavy snowstorms and deep snow accumulated on the ground. Plus there's information on when Washington can expect the first and last snowfalls of the season.
All the numbers are long-term historical averages based on weather data gathered from 1981 to 2010 at the Ronald Reagan Washington National Airport in Arlington, Virginia.
How Often it Snows in Washington
This first table lists monthly and yearly totals for amount of snow and how many days it snows at least 0.1 inches (0.25 centimetres).
These averages don't show how much the snowfall in Washington varies from year to year.
In December, for instance, one in four years totals over 2.5 inches of snow. Another 25 percent of years receive no snow for the month.
Similarly in January, fresh snowfall in the heaviest years amounts to over 6.4 inches, while the lightest years get less than 1.9 inches.
New snow for February ranges from over 5.7 inches in heavy snowfall years to under one-quarter of an inch in light years.
When Washington Has Its First & Last Snowfalls
The first snowfall of winter for Washington usually arrives in December, although one in four Decembers sees no snow. In rare years, November does get snow.
The snow season ends most often in March. For one out of four years, Washington's last snowfall occurs as early as February. Occasionally a few snowflakes fall in April.
Washington is normally free of snow every year from May to October.
How Many Snowstorms Washington DC Gets
About half the days with snowfall in Washington leave just a skiff, amounting to less than an inch, of fresh snow on the ground. For four days a year on average, the amount of new snow totals at least an inch.
Snowstorms of over five inches a day don't happen every year. But major blizzards that dump ten inches or more in one day are even rarer events that occur about twice a decade.
How Much Snow Normally Accumulates in Washington
Snow mostly accumulates in Washington during January and February. Typically, on one or two days in January and in February, the snow covering Washington gets to five or more inches deep.
National Climatic Data Center. NOAA's 1981-2010 Climate Normals.