Alton, NH
Full City Profile · New Hampshire · Belknap County County
1.4
/5.0
F
Poor
416
Population
885/sq mi density
$358,200
Home Value
$597,536 Zillow
$623
Median Rent
27.2% income on rent
47°F
Avg Temperature
99
Violent Crime/100K
559 property/100K
F
Overall
1.4 / 5.0
Below average overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
99 violent crimes/100K
D
Education
1.8 / 5.0
10.3% bachelor's degree or higher
Alton experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 21°F in January while summers reach 71°F in July. Annual precipitation totals 45.6 inches. The area receives 61.9 inches of snow annually. Air quality is rated Good with a median AQI of 35.
Temperature
21°F Jan (-6°C)
71°F Jul (22°C)
| Annual Average | 46.9°F |
| 13% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 71°F (22°C) |
Geography
| Elevation | 565 ft (172 m) |
| Area | 0.5 sq mi (1.3 km²) |
| Population Density | 885/sq mi |
| Coordinates | 43.4564°N, 71.2223°W |
| Timezone | America/New_York |
| County | Belknap County County |
| Nearest Airport | Sanford Seacoast Regional (SFM) 26 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 35.0 |
| Rating | Good |
| Good Days % | 85.2% |
| Unhealthy Days | 0 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0399 ppm |
| PM2.5 (Fine Particles) | 5.4 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 57.4 / 100 |
| Social Vulnerability | 17.0 / 100 |
| Community Resilience | 81.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
| 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 | - | 128 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 3.1 in | Coldest |
| February | 23°F (-5°C) | 2.9 in | Driest |
| March | 32°F (-0°C) | 3.4 in | |
| April | 44°F (7°C) | 3.7 in | |
| May | 56°F (14°C) | 3.5 in | |
| June | 66°F (19°C) | 4.4 in | |
| July | 71°F (22°C) | 4.6 in | Warmest |
| August | 70°F (21°C) | 3.9 in | |
| September | 62°F (17°C) | 3.8 in | |
| October | 50°F (10°C) | 4.8 in | Wettest |
| November | 39°F (4°C) | 3.7 in | |
| December | 28°F (-2°C) | 3.9 in |
Alton has a seasonal temperature swing of 50°F / from 21°F in January to 71°F in July. Total annual precipitation is 45.6 inches, with October being the wettest month (4.8") and February the driest (2.9").