Grafton County Climate
Grafton County, New Hampshire
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
44.2°F
Annual Precip
42.8"
Annual Snowfall
74.2"
Extreme Heat Days
6
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
5a
Minimum winter temperature range for plant survival
2,054
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Grafton County
Climate Verdict
Grafton County has a cool, averaging 44.2°F annually, moderately wet with 42.8 inches of annual precipitation, rare extreme heat with only 6.057142857142857 days above 90°F annually, heavy winter snowfall averaging 74.2 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 18.3°F. summers are pleasantly cool with July averaging 68.3°F. The 50°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
Grafton County closely matches the New Hampshire statewide average temperature of 45.4°F, it is somewhat drier than average for New Hampshire.
Climate Profile
About Grafton County Weather
Cool Temps and Low Moisture
Grafton County averages 44.2°F annually, which is well below the national median. It experiences a classic northern climate with sharp winters and moderate humidity.
Cooler Than the State Median
The county sits about 1.2 degrees below the New Hampshire state average of 45.4°F. This cooler profile is driven by the mountainous terrain found throughout the region.
The Drier Side of the State
Grafton is notably drier than its neighbors, receiving only 42.8 inches of precipitation compared to the 46.4-inch state average. It shares a similar temperature profile with Carroll County.
Vigorous Winters and Gentle Summers
Snowfall is a major factor here, averaging 74.2 inches per year. While winter averages are a cold 21.3°F, summers are pleasant with only 6 days of extreme heat.
Plan for Cold and Snow
With January averages of 18.3°F, reliable thermal protection for homes and vehicles is critical. Summer cooling is less urgent, as the average temperature from June to August is a mild 66.0°F.
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.