Hillsborough County Climate
Hillsborough County, New Hampshire
Avg Annual Temp
47.4°F
Annual Precip
46.6"
Annual Snowfall
60.6"
Extreme Heat Days
9.985714285714286
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.