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Bethlehem, PA
Full City Profile · Pennsylvania · Northampton County County
3.3
/5.0
B
Good
77,069
Population
4,031/sq mi density
$66,443
Median Income
$39,866 per capita
$236,500
Home Value
$344,212 Zillow
$1,311
Median Rent
31.5% income on rent
53°F
Avg Temperature
275 sunny days/yr
281
Violent Crime/100K
2,430 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.7 / 5.0
$66,443 median income, 4.4% unemployment
A+
Affordability
4.7 / 5.0
$236,500 home value, $1,311/mo rent
F
Safety
1.0 / 5.0
281 violent crimes/100K
B+
Education
3.8 / 5.0
35.0% bachelor's degree or higher
Bethlehem experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 30°F in January while summers reach 76°F in July. The area gets 275 sunny days per year. Annual precipitation totals 47.4 inches. The area receives 33.1 inches of snow annually. Air quality is rated Good with a median AQI of 40.
Temperature
30°F Jan (-1°C)
76°F Jul (24°C)
| Annual Average | 53.1°F |
| 2% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 351 ft (107 m) |
| Area | 19.5 sq mi (50.4 km²) |
| Population Density | 4,031/sq mi |
| Coordinates | 40.6264°N, 75.3679°W |
| Timezone | America/New_York |
| County | Northampton County County |
| Nearest Airport | Lehigh Valley International (ABE) 4 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0445 ppm |
| NO₂ (Nitrogen Dioxide) | 13.3 ppb |
| SO₂ (Sulfur Dioxide) | 0.77 ppb |
| PM2.5 (Fine Particles) | 9.5 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 90.0 / 100 |
| Social Vulnerability | 30.6 / 100 |
| Community Resilience | 73.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Avalanche | Very 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 | — | — | 41 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 93 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 3.4 in | |
| February | 30°F (-1°C) | 2.8 in | Coldest, Driest |
| March | 39°F (4°C) | 3.5 in | |
| April | 49°F (9°C) | 3.7 in | |
| May | 60°F (15°C) | 4.5 in | Wettest |
| June | 68°F (20°C) | 4.0 in | |
| July | 76°F (24°C) | 4.3 in | Warmest |
| August | 72°F (22°C) | 4.2 in | |
| September | 65°F (18°C) | 4.1 in | |
| October | 53°F (12°C) | 3.5 in | |
| November | 43°F (6°C) | 3.9 in | |
| December | 33°F (1°C) | 3.5 in |
Bethlehem has a seasonal temperature swing of 46°F / from 30°F in February to 76°F in July. Total annual precipitation is 45.3 inches, with May being the wettest month (4.5") and February the driest (2.8").