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Mount Ephraim, NJ
Full City Profile · New Jersey · Gloucester County County
3.3
/5.0
B
Good
4,648
Population
5,282/sq mi density
$95,137
Median Income
$44,704 per capita
$223,800
Home Value
$299,381 Zillow
$1,509
Median Rent
23.8% income on rent
58°F
Avg Temperature
290 sunny days/yr
109
Violent Crime/100K
3,919 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.5 / 5.0
$95,137 median income, 4.4% unemployment
A+
Affordability
5.0 / 5.0
$223,800 home value, $1,509/mo rent
F
Safety
1.0 / 5.0
109 violent crimes/100K
C+
Education
2.8 / 5.0
23.1% bachelor's degree or higher
Mount Ephraim enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 35°F in January while summers reach 80°F in July. The area gets 290 sunny days per year. Annual precipitation totals 50.7 inches. The area receives 16.1 inches of snow annually. Air quality is rated Good with a median AQI of 39.
Temperature
35°F Jan (2°C)
80°F Jul (27°C)
| Annual Average | 57.7°F |
| 7% above US avg | |
| January Average | 35°F (2°C) |
| July Average | 80°F (27°C) |
| Sunny Days | 290 days/yr |
Geography
| Elevation | 33 ft (10 m) |
| Area | 0.4 sq mi (0.9 km²) |
| Population Density | 5,282/sq mi |
| Coordinates | 39.8795°N, 75.0918°W |
| Timezone | America/New_York |
| County | Gloucester County County |
| Nearest Airport | Philadelphia International (PHL) 8 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0470 ppm |
| PM2.5 (Fine Particles) | 7.5 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 86.6 / 100 |
| Social Vulnerability | 16.0 / 100 |
| Community Resilience | 85.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively Moderate |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
| Coastal Flood | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
2 tsunamis recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1895 | HIGH BRIDGE, NJ | Earthquake | — | — | 89 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 13 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 35°F (2°C) | 3.5 in | Coldest |
| February | 35°F (2°C) | 2.8 in | Driest |
| March | 43°F (6°C) | 4.0 in | |
| April | 53°F (12°C) | 3.8 in | |
| May | 63°F (17°C) | 4.1 in | |
| June | 72°F (22°C) | 3.6 in | |
| July | 80°F (27°C) | 4.5 in | Warmest, Wettest |
| August | 75°F (24°C) | 4.5 in | |
| September | 68°F (20°C) | 3.9 in | |
| October | 57°F (14°C) | 3.2 in | |
| November | 47°F (8°C) | 3.5 in | |
| December | 37°F (3°C) | 3.5 in |
Mount Ephraim has a seasonal temperature swing of 46°F / from 35°F in January to 80°F in July. Total annual precipitation is 44.9 inches, with July being the wettest month (4.5") and February the driest (2.8").