All Countries
Allentown, NJ
Full City Profile · New Jersey · Mercer County County
4.3
/5.0
A
Great
1,926
Population
3,210/sq mi density
$134,583
Median Income
$55,178 per capita
$397,100
Home Value
$708,005 Zillow
$1,517
Median Rent
28.1% income on rent
53°F
Avg Temperature
275 sunny days/yr
A
Overall
4.3 / 5.0
Strong
A+
Economy
4.8 / 5.0
$134,583 median income, 3.5% unemployment
A+
Affordability
5.0 / 5.0
$397,100 home value, $1,517/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
A+
Education
5.0 / 5.0
53.2% bachelor's degree or higher
Allentown experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 31°F in January while summers reach 75°F in July. The area gets 275 sunny days per year. Annual precipitation totals 47.5 inches. The area receives 23.7 inches of snow annually. Air quality is rated Good with a median AQI of 39.
Temperature
31°F Jan (-1°C)
75°F Jul (24°C)
| Annual Average | 52.8°F |
| 2% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 76 ft (23 m) |
| Area | 0.6 sq mi (1.6 km²) |
| Population Density | 3,210/sq mi |
| Coordinates | 40.1786°N, 74.5901°W |
| Timezone | America/New_York |
| County | Mercer County County |
| Nearest Airport | South Jersey Regional (LLY) 21 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 39.0 |
| Rating | Good |
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
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 | — | 144 km |
| 1895 | HIGH BRIDGE, NJ | Earthquake | — | — | 60 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 67 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 3.7 in | Coldest |
| February | 33°F (0°C) | 2.9 in | Driest |
| March | 41°F (5°C) | 4.0 in | |
| April | 51°F (10°C) | 4.0 in | |
| May | 61°F (16°C) | 4.3 in | |
| June | 70°F (21°C) | 3.9 in | |
| July | 75°F (24°C) | 4.8 in | Warmest, Wettest |
| August | 73°F (23°C) | 4.6 in | |
| September | 66°F (19°C) | 4.1 in | |
| October | 55°F (13°C) | 3.4 in | |
| November | 45°F (7°C) | 3.8 in | |
| December | 36°F (2°C) | 3.7 in |
Allentown has a seasonal temperature swing of 44°F / from 31°F in January to 75°F in July. Total annual precipitation is 47.3 inches, with July being the wettest month (4.8") and February the driest (2.9").