Wilmington Snowfall Totals & Accumulation Averages
This page pulls together information on when, how much and how often Wilmington, Delaware has snow.
There are data and descriptions here of how many days it snows and the total amount of snowfall that Wilmington usually gets. There are also monthly and yearly counts of the days that the city normally has heavy snowstorms and deep snow accumulated on the ground. Plus there's information on when Wilmington can expect the first and last snowfalls of the season.
All the numbers are averages, based on weather data gathered from 1981 to 2010 at the New Castle Airport.
How Often it Snows in Wilmington
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 Wilmington varies from year to year.
In December, for instance, one in four years totals over 5.7 inches of snow. Another 25 percent of years receive less than 0.3 inches for the month.
Similarly in January, fresh snowfall in the heaviest years amounts to over 9.7 inches, while the lightest years get under 1.7 inches.
New snow for February ranges from ten or more inches in heavy snowfall years to an inch or less in light years.
When Wilmington Has Its First & Last Snowfalls
The first snowfall of winter for Wilmington usually arrives in December. Although uncommon, November can get a little snow.
The season's last snowfall typically happens in March. For one out of every three or four years, Wilmington's last snowfall occurs as early as February. In unusual years an April snow flurry drops a dusting of snow over the city.
Wilmington is normally free of snow every year from May to October.
How Many Snowstorms Wilmington Gets
Most days of snowfall in Wilmington leave just a skiff, amounting to less than an inch, of fresh snow on the ground. For five days a year on average, the amount of new snow totals at least an inch.
Snowstorms of over five inches a day normally occur once annually. But major blizzards that dump ten inches or more in one day are rare events that don't happen every year.
How Much Snow Normally Accumulates in Wilmington
For about 15 days in winter, Wilmington has at least an inch of snow on the ground.
Snow mostly accumulates during January and February. Typically, on a couple of days in January and in February, the snow covering Wilmington gets to five or more inches deep.
National Climatic Data Center. NOAA's 1981-2010 Climate Normals.