Boston Snowfall Totals & Accumulation Averages
This page pulls together information on when, how much and how often Boston has snow.
There are data and descriptions here of how many days it snows and the total amount of snowfall that Boston 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 Boston can expect the first and last snowfalls of the season.
The first set of monthly snow totals are averages for 2010 to 2019. The other numbers are 30-year averages, based mainly on climate data gathered from 1991 to 2020 at Boston's Logan International Airport on the shore of Boston Harbor. Snow depth data are for 1981 to 2010.
How Often It Snows in Boston
The next two tables list 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 Boston's snowfall varies from year to year.
In December, for instance, one in four years totals over 11.6 inches of snow. Another 25 percent of years receive less than 1.5 inches for the month.
Similarly in January, fresh snowfall in the heaviest years amounts to over 17.8 inches, while the lightest years get less than five inches.
Snow in February ranges from over 19.3 inches in heavy snowfall years to under 4.7 inches in light years.
When Boston Has Its First & Last Snowfalls
Boston's first snowfall of winter usually arrives in December. The season's last snowfall typically happens in March. Over the long-term Boston has averaged half-an-inch or so of snow during October, November and April. But in most years those months have no snow.
Boston is normally free of snow every year from May to September.
How Many Snowstorms Boston Gets
About half the snowfalls in Boston result in just a skiff of less than an inch left on the ground. On an average of 11 days a year, at least an inch of snow lands in one day.
Snowstorms of over five inches a day normally occur three times a year. 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 Boston
For about one-quarter to one-third of winter days, Boston has at least an inch of snow on the ground. Snow mostly accumulates during January.
Typically, for a couple of days in January, the snow covering Boston gets to ten or more inches deep.
Jay Lawrimore, Ron Ray, Scott Applequist, Bryant Korzeniewski, Matthew Menne. 2016. Global Summary of the Month and Year, Version 1.0. NOAA National Centers for Environmental Information.
NOAA National Centers for Environmental Information (NCEI). Climate Normals.