Long Island Snowfall Totals & Accumulation Averages
This page pulls together information on when, how much and how often Long Island in New York state has snow.
There are data and descriptions here of how many days it snows and the total amount of snowfall that Long Island usually gets. There are also monthly and yearly counts of the days that Long Island normally has heavy snowstorms and deep snow accumulated on the ground. Plus there's information on when Long Island can expect the first and last snowfalls of the season.
All the numbers are averages, based on climate data gathered from 1991 to 2020 at the Long Island MacArthur Airport, near Islip.
How Often it Snows on Long Island
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 Long Island's snowfall varies from year to year.
In December, for instance, one in four years totals 6.7 inches or more of snow. Another 25 percent of years receive less than half an inch for the month.
Similarly in January, fresh snowfall in the heaviest years amounts to over 19.9 inches, while the lightest years get 2.4 inches or less.
Snow in February ranges from over 15.2 inches in heavy snowfall years to under 2.5 inches in light years.
When Long Island Has Its First & Last Snowfalls
Long Island's first snowfall of winter usually arrives in December, although at least one in five years see a little snow in November.
The season's last snowfall typically happens in March, but snow in April can happen.
Long Island is normally free of snow every year from May to October.
How Many Snowstorms Long Island Gets
While Long Island gets snow less often than most places in New York State, many snowfalls there are more than just a dusting. For eight days a year on average, the fresh snow on Long Island amounts to at least an inch.
Snowstorms of over five inches a day normally occur just a once or twice a year. And 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 at Long Island
For a small portion of winter days, does Long Island have at least an inch of snow on the ground.
Typically on four days a year, the snow covering Long Island builds up to ten or more inches deep.
NOAA National Centers for Environmental Information (NCEI). Climate Normals.