Nassau County Climate
Nassau County, New York
Avg Annual Temp
54.8°F
Annual Precip
45.6"
Annual Snowfall
22.0"
Extreme Heat Days
11.6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Nassau County Weather
Mild Coastal Living on Long Island
Nassau County averages 54.8°F annually, aligning closely with the national median. Its maritime climate provides buffered temperatures compared to inland New York.
One of New York’s Warmest Counties
The annual average of 54.8°F is over seven degrees warmer than the state average of 47.4°F. Nassau consistently ranks as one of the mildest regions in the entire state.
Warmer and Drier than Upstate
Nassau sees only 22 inches of snow, a fraction of the 100+ inches seen in northern counties like Monroe. It is slightly cooler than Manhattan but maintains a similar humid subtropical feel.
Hot Summers and Soft Winters
Nassau enjoys 12 days per year over 90°F with a July average of 76.2°F. Winters are relatively mild, with January temperatures averaging 33.9°F.
Plan for Humidity and Heat
Quality air conditioning is essential for the 12 days of extreme heat and high coastal humidity. Light winter gear is usually sufficient for the modest 22 inches of annual snowfall.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.