Rockingham County Climate
Rockingham County, New Hampshire
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
48.2°F
Annual Precip
47.3"
Annual Snowfall
64.9"
Extreme Heat Days
12
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
6a
Minimum winter temperature range for plant survival
2,545
Supports most vegetables & fruits
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Rockingham County
Climate Verdict
Rockingham County has a cool, averaging 48.2°F annually, moderately wet with 47.3 inches of annual precipitation, rare extreme heat with only 12.150000000000002 days above 90°F annually, heavy winter snowfall averaging 64.9 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are very cold — January averages 24.4°F. summers are warm — July averages 71.5°F. The 47°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
Rockingham County closely matches the New Hampshire statewide average temperature of 45.4°F.
Climate Profile
About Rockingham County Weather
New Hampshire's Warmest Coastal Influence
Rockingham County is the warmest in the state with a 48.2°F annual average. While still cooler than the US median, its coastal proximity provides a slightly more temperate climate.
The State's Temperature Leader
At 48.2°F, Rockingham stays nearly 3 degrees warmer than the state average of 45.4°F. It represents the warmest climate New Hampshire has to offer.
Highest Heat in the Region
Rockingham records 12 days of extreme heat, the highest in the state and double that of Carroll County. It also sees the least snow in this group at 64.9 inches.
Warm Summers and Softened Winters
Winter averages are the mildest in the state at 27.1°F. Conversely, July is the state's warmest with a 71.5°F average and frequent spikes above 90°F.
Cooling is a Summer Priority
Given the 12 days of extreme heat, robust air conditioning is a primary concern for residents. Winter still requires attention, as January averages stay below freezing at 24.4°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.