Juliustown, NJ
Full City Profile · New Jersey · Mercer County County
2.6
/5.0
C+
Fair
207
Population
174/sq mi density
$455,600
Home Value
$306,260 Zillow
55°F
Avg Temperature
C+
Overall
2.6 / 5.0
Fair overall score based on economy, affordability, safety and education
C+
Education
2.6 / 5.0
20.2% bachelor's degree or higher
Juliustown experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 33°F in January while summers reach 77°F in July. Annual precipitation totals 42.8 inches. The area receives 24.8 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
33°F Jan (0°C)
77°F Jul (25°C)
| Annual Average | 54.5°F |
| 1% above US avg | |
| January Average | 33°F (0°C) |
| July Average | 77°F (25°C) |
Geography
| Elevation | 113 ft (34 m) |
| Area | 1.2 sq mi (3.1 km²) |
| Population Density | 174/sq mi |
| Coordinates | 40.0121°N, 74.6715°W |
| Timezone | America/New_York |
| County | Mercer County County |
| Nearest Airport | South Jersey Regional (LLY) 10 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
| Good Days % | 67.2% |
| Unhealthy Days | 5 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0450 ppm |
| PM2.5 (Fine Particles) | 9.6 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.4 / 100 |
| Social Vulnerability | 46.9 / 100 |
| Community Resilience | 70.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively High |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Very High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
| Coastal Flood | Relatively Low |
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 | - | - | 75 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | - | - | 51 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 33°F (0°C) | 3.0 in | Coldest |
| February | 35°F (2°C) | 2.6 in | Driest |
| March | 43°F (6°C) | 3.8 in | |
| April | 53°F (11°C) | 3.4 in | |
| May | 62°F (17°C) | 3.0 in | |
| June | 72°F (22°C) | 3.7 in | |
| July | 77°F (25°C) | 5.2 in | Warmest, Wettest |
| August | 74°F (24°C) | 4.4 in | |
| September | 67°F (20°C) | 3.4 in | |
| October | 56°F (13°C) | 3.7 in | |
| November | 46°F (8°C) | 3.0 in | |
| December | 37°F (3°C) | 3.7 in |
Juliustown has a seasonal temperature swing of 44°F / from 33°F in January to 77°F in July. Total annual precipitation is 42.8 inches, with July being the wettest month (5.2") and February the driest (2.6").