Suffolk County Climate
Suffolk County, Massachusetts
Avg Annual Temp
51.5°F
Annual Precip
46.5"
Annual Snowfall
49.2"
Extreme Heat Days
17.15
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.