All Countries
Union, NH
Full City Profile · New Hampshire · Strafford County County
1.3
/5.0
F
Poor
354
Population
1,142/sq mi density
47°F
Avg Temperature
246 sunny days/yr
328
Violent Crime/100K
3,545 property/100K
F
Overall
1.3 / 5.0
Below average overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
328 violent crimes/100K
D
Education
1.6 / 5.0
7.4% bachelor's degree or higher
Union experiences four distinct seasons with an average annual temperature of 47°F (8°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 46.3 inches. The area receives 56.6 inches of snow annually. Air quality is rated Good with a median AQI of 37.
Temperature
24°F Jan (-5°C)
71°F Jul (22°C)
| Annual Average | 47.4°F |
| 12% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 246 days/yr |
Geography
| Elevation | 481 ft (147 m) |
| Area | 0.3 sq mi (0.8 km²) |
| Population Density | 1,142/sq mi |
| Coordinates | 43.4912°N, 71.0231°W |
| Timezone | America/New_York |
| County | Strafford County County |
| Nearest Airport | Sanford Seacoast Regional (SFM) 17 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 64.1 / 100 |
| Social Vulnerability | 16.6 / 100 |
| Community Resilience | 73.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Coastal Flood | Relatively 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 | — | 112 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-5°C) | 3.3 in | Driest |
| February | 23°F (-5°C) | 3.4 in | Coldest |
| March | 32°F (0°C) | 3.5 in | |
| April | 43°F (6°C) | 4.0 in | |
| May | 54°F (12°C) | 3.9 in | |
| June | 63°F (17°C) | 3.6 in | |
| July | 71°F (22°C) | 3.6 in | Warmest |
| August | 67°F (19°C) | 3.7 in | |
| September | 58°F (15°C) | 3.4 in | |
| October | 47°F (9°C) | 4.1 in | |
| November | 37°F (3°C) | 4.8 in | Wettest |
| December | 26°F (-3°C) | 4.0 in |
Union has a seasonal temperature swing of 48°F / from 23°F in February to 71°F in July. Total annual precipitation is 45.3 inches, with November being the wettest month (4.8") and January the driest (3.3").