Hillsborough County Climate
Hillsborough County, New Hampshire
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
47.4°F
Annual Precip
46.6"
Annual Snowfall
60.6"
Extreme Heat Days
10
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
2,460
Favors cool-season crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Hillsborough County
Climate Verdict
Hillsborough County has a cool, averaging 47.4°F annually, moderately wet with 46.6 inches of annual precipitation, rare extreme heat with only 9.985714285714286 days above 90°F annually, heavy winter snowfall averaging 60.6 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 23.1°F. summers are warm — July averages 71.1°F. The 48°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
Hillsborough County closely matches the New Hampshire statewide average temperature of 45.4°F.
Climate Profile
About Hillsborough County Weather
Warmest of the North
Hillsborough County averages 47.4°F annually, which is warmer than most of the state but still cooler than the US median. It experiences a more temperate version of the humid continental climate.
One of the State's Warmest
Hillsborough is significantly warmer than the state average of 45.4°F. Its southern location allows for more heat accumulation than the northern mountain counties.
More Heat Than Northern Neighbors
Hillsborough sees 10 days of extreme heat, which is nearly double the amount experienced in northern Grafton. It also records less snowfall than its neighbors, averaging 60.6 inches.
Hotter Summers and Milder Winters
The county averages 10 days over 90°F, the second-highest in the state. Winter is relatively mild for New Hampshire, with a December-to-February average of 25.7°F.
Prioritize Cooling and Efficiency
Residents should invest in air conditioning to handle the 71.1°F July average and frequent heat days. Winter requires standard preparation for 60.6 inches of snow and January lows of 23.1°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.