Suffolk County Climate
Suffolk County, Massachusetts
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
51.5°F
Annual Precip
46.5"
Annual Snowfall
49.2"
Extreme Heat Days
17
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
7a
Minimum winter temperature range for plant survival
3,048
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Suffolk County
Climate Verdict
Suffolk County has a mild, with an average annual temperature of 51.5°F, moderately wet with 46.5 inches of annual precipitation, rare extreme heat with only 17.15 days above 90°F annually, moderate snowfall of 49.2 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 29.0°F. summers are warm — July averages 74.3°F. The 45°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Winter sports enthusiasts benefit from reliable snow cover for 3-4 months annually.
Regional Context
Suffolk County closely matches the Massachusetts statewide average temperature of 49.5°F.
Climate Profile
About Suffolk County Weather
Massachusetts' Urban Heat Hub
Suffolk County is the warmest in this group, with an average annual temperature of 51.5°F. This exceeds the national median, largely due to the urban heat island effect centered in Boston.
The State's Temperature Leader
Suffolk ranks well above the 49.5°F state average, making it the warmest county in Massachusetts. Its precipitation levels are slightly below the state average, totaling 46.5 inches annually.
Warmer Than Surrounding Suburbs
Suffolk is nearly two degrees warmer on average than neighboring Middlesex County. It also experiences more extreme heat days (17) than Norfolk (14) or Middlesex (15) due to its dense urban footprint.
Sizzling Julys and Brisk Winters
Summer peaks in July with a 74.3°F average, the highest in the region, including 17 days over 90°F. Despite the heat, the county still sees 49.2 inches of snow during the 31.6°F winter season.
Cooling is the Priority
Robust air conditioning is vital here to combat the 17 days of extreme heat and high urban temperatures. Residents should also keep snow shovels ready for the nearly 50 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.