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Unionville CDP (Chester County), PA
Full City Profile · Pennsylvania · Chester County County
4.0
/5.0
A
Great
764
Population
888/sq mi density
$145,000
Median Income
$77,571 per capita
$482,500
Home Value
$606,063 Zillow
$2,300
Median Rent
15.9% income on rent
52°F
Avg Temperature
293 sunny days/yr
114
Violent Crime/100K
1,123 property/100K
A
Overall
4.0 / 5.0
Strong
A+
Economy
5.0 / 5.0
$145,000 median income, 0.0% unemployment
A+
Affordability
4.8 / 5.0
$482,500 home value, $2,300/mo rent
F
Safety
1.0 / 5.0
114 violent crimes/100K
A+
Education
5.0 / 5.0
53.6% bachelor's degree or higher
Unionville CDP (Chester County) experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 31°F in January while summers reach 74°F in July. The area gets 293 sunny days per year. Annual precipitation totals 47.1 inches. Air quality is rated Good with a median AQI of 40.
Temperature
31°F Jan (-1°C)
74°F Jul (23°C)
| Annual Average | 52.3°F |
| 3% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 488 ft (149 m) |
| Area | 0.9 sq mi (2.2 km²) |
| Population Density | 888/sq mi |
| Coordinates | 39.9005°N, 75.7304°W |
| Timezone | America/New_York |
| County | Chester County County |
| Nearest Airport | Philadelphia International (PHL) 26 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 40.0 |
| Rating | Good |
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 | — | — | 112 km |
| 1840 | PHILADELPHIA, PENNSYLVANIA | Earthquake | — | — | 47 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 | 32°F (-0°C) | 2.9 in | Driest |
| March | 41°F (5°C) | 3.8 in | |
| April | 50°F (10°C) | 3.8 in | |
| May | 60°F (16°C) | 4.4 in | |
| June | 69°F (21°C) | 4.2 in | |
| July | 74°F (23°C) | 4.6 in | Warmest, Wettest |
| August | 73°F (23°C) | 3.9 in | |
| September | 66°F (19°C) | 4.3 in | |
| October | 54°F (12°C) | 3.4 in | |
| November | 45°F (7°C) | 3.9 in | |
| December | 35°F (2°C) | 3.7 in |
Unionville CDP (Chester County) has a seasonal temperature swing of 43°F / from 31°F in January to 74°F in July. Total annual precipitation is 46.5 inches, with July being the wettest month (4.6") and February the driest (2.9").