Radnor, OH
Full City Profile · Ohio · Delaware County County
4.5
/5.0
A+
Excellent
188
Population
261/sq mi density
$70,245
Median Income
$39,927 per capita
$179,900
Home Value
$413,523 Zillow
51°F
Avg Temperature
A+
Overall
4.5 / 5.0
Strong
A
Economy
4.4 / 5.0
$70,245 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$179,900 home value, /mo rent
B+
Education
4.0 / 5.0
37.1% bachelor's degree or higher
Radnor experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 27°F in January while summers reach 73°F in July. Annual precipitation totals 39.3 inches. The area receives 26.3 inches of snow annually. Air quality is rated Good with a median AQI of 42.
Temperature
27°F Jan (-3°C)
73°F Jul (23°C)
| Annual Average | 50.8°F |
| 6% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 73°F (23°C) |
Geography
| Elevation | 937 ft (286 m) |
| Area | 0.7 sq mi (1.9 km²) |
| Population Density | 261/sq mi |
| Coordinates | 40.3852°N, 83.1459°W |
| Timezone | America/New_York |
| County | Delaware County County |
| Nearest Airport | John Glenn Columbus International (CMH) 30 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
| Good Days % | 82.6% |
| Unhealthy Days | 1 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0445 ppm |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 78.8 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 95.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 2.6 in | Coldest |
| February | 29°F (-2°C) | 2.0 in | Driest |
| March | 39°F (4°C) | 2.7 in | |
| April | 50°F (10°C) | 3.7 in | |
| May | 61°F (16°C) | 4.1 in | |
| June | 70°F (21°C) | 4.8 in | Wettest |
| July | 73°F (23°C) | 4.0 in | Warmest |
| August | 71°F (22°C) | 3.7 in | |
| September | 64°F (18°C) | 3.5 in | |
| October | 53°F (12°C) | 2.8 in | |
| November | 41°F (5°C) | 3.0 in | |
| December | 32°F (-0°C) | 2.6 in |
Radnor has a seasonal temperature swing of 46°F / from 27°F in January to 73°F in July. Total annual precipitation is 39.3 inches, with June being the wettest month (4.8") and February the driest (2.0").