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Long Island, NY Climate

- Average Monthly Temperatures and Average Monthly Precipitation

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Main Beach, East Hampton, NY

Main Beach, East Hampton, NY

Photo © Linda Tagliaferro
Long Island, New York, is divided into two counties: Nassau to the west, and Suffolk County on the eastern flank of the island (not counting Brooklyn and Queens, which are geographically part of Long Island, but politically party of New York City. Both are on the eastern flank of the Island.) The beach-fringed island has four seasons: winter, spring, summer and fall, with hot, sunny summers and chilly, snowy winters. Below are the average temperatures for Long Island, New York's two counties.

Please remember that these are average temperatures, and the weather can, and does, get hotter in the summer and colder than these monthly averages.

Here are the average monthly temperatures for Nassau County, Long Island, NY:
Weather is recorded at Nassau County's Mineola, NY weather station.

January - 31.9 degrees Fahrenheit/-0.05 Celsius
February - 33.4 F./7 C.
March - 41.1 F./5.05 C.
April - 49.7 F./ 9.8 C.
May - 59.5 F./ 15.2 C.
June 68.7 F./20.3 C.
July - 74.2 F./23.4 C.
August - 72.8 F./22.6 C.
September - 65.5 F./18.6 C.
October - 55 F./12.7 C.
November - 46.2 F./7.8 C.
December 36.6 F./2.5 C.

Average monthly temperatures for Suffolk County, Long Island, NY:
Weather is recorded at Suffolk County's Long Island MacArthur Airport, Islip, NY.

January - 30.9 degrees Fahrenheit/-0.6 C.
February - 32.4 F./0.2 C.
March - 39.8 F./4.3 C.
April - 49.1 F./9.5 C.
May - 52.2 F./11.2 C.
June 68.5 f./20.2 C.
July - 74.6 F./23.6 C.
August - 73.1 F./22.8 C.
September - 65.8 F./18.7 C.
October - 54.3 F./12.3 C.
November - 44.9 F./7.1 C.
December - 35.7 F./2 C.

Here are the average monthly precipitation (rain and snow) for Nassau County, Long Island, NY:
Weather is recorded at Nassau County's Mineola, NY weather station.

January - 4.01"
February - 2.96"
March - 4.28"
April - 4.26"
May - 4"
June 3.66"
July - 3.88"
August - 3.74"
September - 3.98"
October - 3.53"
November - 4"
December 3.80"

Average monthly precipitation (rain and snow) for Suffolk County, Long Island, NY:
Weather is recorded at Suffolk County's Long Island MacArthur Airport, Islip, NY.

January - 4.27"
February - 3.33"
March - 4.76"
April - 4.13"
May - 3.90"
June 3.71"
July - 2.93"
August - 4.48"
September - 3.39"
October - 3.63"
November - 3.86
December - 4.13"

Source: The Northeast Regional Climate Center at Cornell University

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