Suffolk County Climate
Suffolk County, New York
Avg Annual Temp
52.6°F
Annual Precip
45.2"
Annual Snowfall
29.3"
Extreme Heat Days
8.499999999999998
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Suffolk County Weather
A Mild Coastal Outlook in Suffolk
Suffolk County averages 52.6°F annually, placing it very close to the national median temperature for a temperate maritime climate. Its coastal position helps moderate the air compared to the harsher extremes seen in the American interior.
Warmest Among New York Counties
With an annual average of 52.6°F, Suffolk is significantly warmer than the New York state average of 47.4°F. This reflects the island's unique position as one of the state's most temperate regions.
Maritime Influence Dampens Regional Extremes
While neighboring inland counties face sharper temperature drops, Suffolk maintains a steadier profile with 45.2 inches of annual precipitation. This is slightly wetter than the state average of 43.3 inches due to frequent Atlantic storm tracks.
Milder Winters and Humid Summers
Winter brings a manageable 29.3 inches of snow, far below the upstate norm, with January averages staying at 31.8°F. Summers are warm but rarely scorching, averaging 8 days per year where temperatures hit or exceed 90°F.
Prepare for Salt and Humidity
Residents should invest in dehumidification systems to manage the 74.0°F July humidity. Additionally, coastal homeowners need to plan for high-moisture weather events given the 45.2 inches of annual rainfall.
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.