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Colonia, NJ
Full City Profile · New Jersey · Union County County
3.8
/5.0
B+
Good
18,294
Population
4,539/sq mi density
$134,301
Median Income
$51,419 per capita
$473,200
Home Value
$621,925 Zillow
$1,964
Median Rent
33.2% income on rent
55°F
Avg Temperature
275 sunny days/yr
181
Violent Crime/100K
1,092 property/100K
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.9 / 5.0
$134,301 median income, 2.8% unemployment
A+
Affordability
4.7 / 5.0
$473,200 home value, $1,964/mo rent
F
Safety
1.0 / 5.0
181 violent crimes/100K
A+
Education
4.7 / 5.0
46.5% bachelor's degree or higher
Colonia experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 32°F in January while summers reach 77°F in July. The area gets 275 sunny days per year. Annual precipitation totals 48.7 inches. The area receives 21.4 inches of snow annually. Air quality is rated Good with a median AQI of 39.
Temperature
32°F Jan (0°C)
77°F Jul (25°C)
| Annual Average | 54.9°F |
| 2% above US avg | |
| January Average | 32°F (0°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 86 ft (26 m) |
| Area | 3.9 sq mi (10.1 km²) |
| Population Density | 4,539/sq mi |
| Coordinates | 40.5893°N, 74.3114°W |
| Timezone | America/New_York |
| County | Union County County |
| Nearest Airport | Newark Liberty International (EWR) 10 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| NO₂ (Nitrogen Dioxide) | 26.6 ppb |
| SO₂ (Sulfur Dioxide) | 0.74 ppb |
| CO (Carbon Monoxide) | 0.42 ppm |
| PM2.5 (Fine Particles) | 9.8 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.5 / 100 |
| Social Vulnerability | 55.8 / 100 |
| Community Resilience | 30.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Very High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Very High |
| Ice Storm | Very High |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
| Coastal Flood | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
3 tsunamis recorded within 500 km. Highest wave on record: 0.3 m (1 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1964 | LONG ISLAND, NY | Meteorological | 0.3 m | — | 105 km |
| 1895 | HIGH BRIDGE, NJ | Earthquake | — | — | 49 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 116 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 32°F (0°C) | 3.9 in | Coldest |
| February | 33°F (1°C) | 3.0 in | Driest |
| March | 41°F (5°C) | 4.1 in | |
| April | 51°F (11°C) | 4.1 in | |
| May | 62°F (16°C) | 4.5 in | |
| June | 70°F (21°C) | 3.8 in | |
| July | 77°F (25°C) | 4.9 in | Warmest, Wettest |
| August | 74°F (23°C) | 4.4 in | |
| September | 67°F (19°C) | 4.3 in | |
| October | 55°F (13°C) | 3.7 in | |
| November | 46°F (8°C) | 4.1 in | |
| December | 36°F (2°C) | 3.8 in |
Colonia has a seasonal temperature swing of 45°F / from 32°F in January to 77°F in July. Total annual precipitation is 48.5 inches, with July being the wettest month (4.9") and February the driest (3.0").