Marshallton CDP (Chester County), PA
Full City Profile · Pennsylvania · Chester County County
4.4
/5.0
A
Great
491
Population
1,067/sq mi density
$103,182
Median Income
$50,363 per capita
$455,600
Home Value
$570,223 Zillow
52°F
Avg Temperature
A
Overall
4.4 / 5.0
Strong
A
Economy
4.2 / 5.0
$103,182 median income, 7.1% unemployment
A
Affordability
4.2 / 5.0
$455,600 home value, /mo rent
A+
Education
4.9 / 5.0
49.2% bachelor's degree or higher
Marshallton CDP (Chester County) experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 30°F in January while summers reach 75°F in July. Annual precipitation totals 50.9 inches. The area receives 30.5 inches of snow annually. Air quality is rated Good with a median AQI of 41.
Temperature
30°F Jan (-1°C)
75°F Jul (24°C)
| Annual Average | 52.4°F |
| 3% below US avg | |
| January Average | 30°F (-1°C) |
| July Average | 75°F (24°C) |
Geography
| Elevation | 344 ft (105 m) |
| Area | 0.5 sq mi (1.2 km²) |
| Population Density | 1,067/sq mi |
| Coordinates | 39.9480°N, 75.6771°W |
| Timezone | America/New_York |
| County | Chester County County |
| Nearest Airport | Philadelphia International (PHL) 24 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 41.0 |
| Rating | Good |
| Good Days % | 72.7% |
| Unhealthy Days | 3 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0450 ppm |
| PM2.5 (Fine Particles) | 9.5 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 91.9 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 85.2 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Relatively Moderate |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very High |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively High |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
| Coastal Flood | No Rating |
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 | - | - | 105 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | - | - | 44 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 30°F (-1°C) | 3.7 in | Coldest |
| February | 32°F (-0°C) | 3.1 in | Driest |
| March | 40°F (4°C) | 4.6 in | |
| April | 51°F (10°C) | 3.8 in | |
| May | 61°F (16°C) | 3.8 in | |
| June | 70°F (21°C) | 4.0 in | |
| July | 75°F (24°C) | 4.4 in | Warmest |
| August | 73°F (23°C) | 4.8 in | |
| September | 66°F (19°C) | 5.7 in | Wettest |
| October | 54°F (12°C) | 4.8 in | |
| November | 43°F (6°C) | 3.6 in | |
| December | 35°F (2°C) | 4.7 in |
Marshallton CDP (Chester County) has a seasonal temperature swing of 45°F / from 30°F in January to 75°F in July. Total annual precipitation is 50.9 inches, with September being the wettest month (5.7") and February the driest (3.1").