Grafton County Climate
Grafton County, New Hampshire
Avg Annual Temp
44.2°F
Annual Precip
42.8"
Annual Snowfall
74.2"
Extreme Heat Days
6.057142857142857
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.