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Portsmouth, NH
Full City Profile · New Hampshire · York County County
3.6
/5.0
B+
Good
22,332
Population
1,426/sq mi density
$105,756
Median Income
$69,569 per capita
$640,600
Home Value
$775,217 Zillow
$1,778
Median Rent
28.3% income on rent
48°F
Avg Temperature
259 sunny days/yr
128
Violent Crime/100K
1,635 property/100K
B+
Overall
3.6 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$105,756 median income, 1.4% unemployment
B
Affordability
3.3 / 5.0
$640,600 home value, $1,778/mo rent
F
Safety
1.0 / 5.0
128 violent crimes/100K
A+
Education
5.0 / 5.0
63.4% bachelor's degree or higher
Portsmouth experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 24°F in January while summers reach 70°F in July. The area gets 259 sunny days per year. Annual precipitation totals 50.7 inches. The area receives 65.0 inches of snow annually. Air quality is rated Good with a median AQI of 37.
Temperature
24°F Jan (-4°C)
70°F Jul (21°C)
| Annual Average | 47.6°F |
| 12% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 259 days/yr |
Geography
| Elevation | 51 ft (16 m) |
| Area | 15.7 sq mi (40.6 km²) |
| Population Density | 1,426/sq mi |
| Coordinates | 43.0606°N, 70.7803°W |
| Timezone | America/New_York |
| County | York County County |
| Nearest Airport | Portsmouth International At Pease (PSM) 2 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 | — | 120 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 3.5 in | Coldest |
| February | 27°F (-3°C) | 3.2 in | Driest |
| March | 35°F (2°C) | 3.6 in | |
| April | 45°F (7°C) | 4.1 in | |
| May | 56°F (13°C) | 3.5 in | |
| June | 65°F (18°C) | 3.4 in | |
| July | 70°F (21°C) | 3.2 in | Warmest |
| August | 69°F (20°C) | 3.3 in | |
| September | 61°F (16°C) | 3.4 in | |
| October | 50°F (10°C) | 4.1 in | |
| November | 41°F (5°C) | 4.5 in | Wettest |
| December | 30°F (-1°C) | 3.8 in |
Portsmouth has a seasonal temperature swing of 46°F / from 24°F in January to 70°F in July. Total annual precipitation is 43.4 inches, with November being the wettest month (4.5") and February the driest (3.2").