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Swarthmore, PA
Full City Profile · Pennsylvania · Delaware County County
3.8
/5.0
B+
Good
6,524
Population
4,660/sq mi density
$146,992
Median Income
$66,784 per capita
$557,900
Home Value
$454,071 Zillow
$1,493
Median Rent
27.5% income on rent
56°F
Avg Temperature
293 sunny days/yr
31
Violent Crime/100K
467 property/100K
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.6 / 5.0
$146,992 median income, 4.9% unemployment
A+
Affordability
4.5 / 5.0
$557,900 home value, $1,493/mo rent
F
Safety
1.0 / 5.0
31 violent crimes/100K
A+
Education
5.0 / 5.0
79.2% bachelor's degree or higher
Swarthmore enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 34°F in January while summers reach 79°F in July. The area gets 293 sunny days per year. Annual precipitation totals 44.1 inches. The area receives 23.1 inches of snow annually. Air quality is rated Good with a median AQI of 40.
Temperature
34°F Jan (1°C)
79°F Jul (26°C)
| Annual Average | 56.3°F |
| 4% above US avg | |
| January Average | 34°F (1°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 126 ft (38 m) |
| Area | 0.5 sq mi (1.4 km²) |
| Population Density | 4,660/sq mi |
| Coordinates | 39.9023°N, 75.3487°W |
| Timezone | America/New_York |
| County | Delaware County County |
| Nearest Airport | Philadelphia International (PHL) 6 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0484 ppm |
| NO₂ (Nitrogen Dioxide) | 15.0 ppb |
| PM2.5 (Fine Particles) | 10.3 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 92.9 / 100 |
| Social Vulnerability | 33.0 / 100 |
| Community Resilience | 84.3 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively High |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Coastal Flood | Relatively Moderate |
| 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 | — | — | 94 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 17 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 34°F (1°C) | 3.7 in | |
| February | 33°F (1°C) | 2.9 in | Coldest, Driest |
| March | 42°F (5°C) | 3.9 in | |
| April | 51°F (11°C) | 3.8 in | |
| May | 62°F (16°C) | 4.3 in | |
| June | 70°F (21°C) | 3.8 in | |
| July | 79°F (26°C) | 4.6 in | Warmest, Wettest |
| August | 74°F (23°C) | 4.1 in | |
| September | 67°F (19°C) | 4.2 in | |
| October | 55°F (13°C) | 3.2 in | |
| November | 46°F (8°C) | 3.7 in | |
| December | 36°F (2°C) | 3.6 in |
Swarthmore has a seasonal temperature swing of 46°F / from 33°F in February to 79°F in July. Total annual precipitation is 45.7 inches, with July being the wettest month (4.6") and February the driest (2.9").