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Somersworth, NH
Full City Profile · New Hampshire · York County County
3.3
/5.0
B
Good
12,060
Population
1,231/sq mi density
$79,677
Median Income
$42,438 per capita
$295,800
Home Value
$429,600 Zillow
$1,410
Median Rent
28.5% income on rent
48°F
Avg Temperature
246 sunny days/yr
125
Violent Crime/100K
2,947 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.4 / 5.0
$79,677 median income, 1.7% unemployment
A+
Affordability
4.6 / 5.0
$295,800 home value, $1,410/mo rent
F
Safety
1.0 / 5.0
125 violent crimes/100K
B
Education
3.3 / 5.0
28.7% bachelor's degree or higher
Somersworth experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 24°F in January while summers reach 71°F in July. The area gets 246 sunny days per year. Annual precipitation totals 41.2 inches. Air quality is rated Good with a median AQI of 37.
Temperature
24°F Jan (-4°C)
71°F Jul (22°C)
| Annual Average | 47.7°F |
| 12% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 246 days/yr |
Geography
| Elevation | 208 ft (63 m) |
| Area | 10.0 sq mi (25.9 km²) |
| Population Density | 1,231/sq mi |
| Coordinates | 43.2535°N, 70.8879°W |
| Timezone | America/New_York |
| County | York County County |
| Nearest Airport | Portsmouth International At Pease (PSM) 13 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0395 ppm |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 81.5 / 100 |
| Social Vulnerability | 16.3 / 100 |
| Community Resilience | 84.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Very High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| Coastal Flood | Relatively High |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 3.6 m (12 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2008 | MAINE | Avalanche | 3.6 m | — | 113 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 3.3 in | Coldest |
| February | 25°F (-4°C) | 3.2 in | Driest |
| March | 34°F (1°C) | 3.5 in | |
| April | 45°F (7°C) | 4.1 in | |
| May | 56°F (13°C) | 3.7 in | |
| June | 65°F (18°C) | 3.4 in | |
| July | 71°F (22°C) | 3.4 in | Warmest |
| August | 68°F (20°C) | 3.4 in | |
| September | 60°F (16°C) | 3.4 in | |
| October | 49°F (9°C) | 4.1 in | |
| November | 39°F (4°C) | 4.7 in | Wettest |
| December | 28°F (-2°C) | 3.8 in |
Somersworth has a seasonal temperature swing of 47°F / from 24°F in January to 71°F in July. Total annual precipitation is 43.8 inches, with November being the wettest month (4.7") and February the driest (3.2").