Plymouth County Climate
Plymouth County, Massachusetts
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
50.7°F
Annual Precip
51.4"
Annual Snowfall
38.8"
Extreme Heat Days
10
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6b
Minimum winter temperature range for plant survival
2,777
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Plymouth County
Climate Verdict
Plymouth County has a mild, with an average annual temperature of 50.7°F, moderately wet with 51.4 inches of annual precipitation, rare extreme heat with only 10.2625 days above 90°F annually, moderate snowfall of 38.8 inches annually. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are cold, with January averaging 29.3°F. summers are warm — July averages 72.6°F. The 43°F seasonal variation provides noticeable but manageable change.
Outdoor & Gardening Guidance
Growing season and gardening data is currently limited for Plymouth County. Check the USDA Plant Hardiness Zone Map and local extension office for specific guidance.
Regional Context
Plymouth County closely matches the Massachusetts statewide average temperature of 49.5°F, it is somewhat wetter than average for Massachusetts.
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 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.