Merrimack County Climate
Merrimack County, New Hampshire
Avg Annual Temp
45.7°F
Annual Precip
46.8"
Annual Snowfall
73.7"
Extreme Heat Days
6.62
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Merrimack County Weather
Central New England's Balanced Climate
Merrimack County averages 45.7°F annually, falling on the cooler side of the national median. This region serves as a typical example of the Northeast's seasonal volatility.
Reflecting the State Average
The county's 45.7°F annual temperature almost perfectly mirrors the New Hampshire state average of 45.4°F. It acts as the climatic heart of the state.
Consistent With Regional Patterns
With 46.8 inches of annual precipitation, Merrimack is nearly identical to the state average. Its 73.7 inches of snow is also very close to the totals found in neighboring Belknap.
Standard Winters and Sunny Julys
Winters are cold with a 23.9°F average and over six feet of snow annually. July heats up to an average of 69.4°F, bringing about 7 days of 90-degree weather.
All-Season Home Preparation
Efficient HVAC systems are necessary to bridge the gap between 21.1°F Januarys and 69.4°F Julys. Good drainage is also helpful given the 46.8 inches of annual rainfall.
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.