Plymouth County Climate
Plymouth County, Massachusetts
Avg Annual Temp
50.7°F
Annual Precip
51.4"
Annual Snowfall
38.8"
Extreme Heat Days
10.2625
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Plymouth County Weather
The Coast's Moderating Influence
Plymouth County averages 50.7°F annually, benefiting from its proximity to the Atlantic Ocean. While its average is lower than the national median, it avoids the harshest continental extremes found further inland.
One of the State's Wettest Areas
Plymouth is significantly wetter than the state average, receiving 51.4 inches of precipitation annually compared to the state's 47.4 inches. It ranks as one of the warmer counties in Massachusetts at 50.7°F.
Less Snow Than Northern Neighbors
Despite having the same 50.7°F average as Norfolk, Plymouth receives significantly less snow at 38.8 inches. This is likely due to the coastal warming effect which often turns snow to rain during winter storms.
Humid Summers and Damp Winters
The county experiences 10 days of extreme heat per year, with July averages reaching 72.6°F. Winters are relatively mild for the state, averaging 31.7°F with less snow accumulation than neighboring counties.
Plan for Heavy Rain
Prioritize basement waterproofing and high-capacity gutters to handle the 51.4 inches of annual rain. Outdoor planning should account for 10 days of extreme heat and moderate, but occasional, heavy 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.