Nassau County Climate
Nassau County, New York
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
54.8°F
Annual Precip
45.6"
Annual Snowfall
22.0"
Extreme Heat Days
12
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7b
Minimum winter temperature range for plant survival
3,520
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Nassau County
Climate Verdict
Nassau County has a mild, with an average annual temperature of 54.8°F, moderately wet with 45.6 inches of annual precipitation, rare extreme heat with only 11.6 days above 90°F annually, moderate snowfall of 22.0 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 33.9°F. summers are warm — July averages 76.2°F. The 42°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Nassau County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Nassau County is 7.2°F warmer than the New York statewide average of 47.5°F, it is somewhat wetter than average for New York.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.