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South Mount Vernon, OH
Full City Profile · Ohio · Knox County County
2.3
/5.0
C
Fair
702
Population
1,404/sq mi density
$50,234
Median Income
$18,574 per capita
$1,073
Median Rent
21.8% income on rent
49°F
Avg Temperature
282 sunny days/yr
81
Violent Crime/100K
2,421 property/100K
C
Overall
2.3 / 5.0
Fair overall score based on economy, affordability, safety and education
D
Economy
1.6 / 5.0
$50,234 median income, 10.2% unemployment
A
Affordability
4.2 / 5.0
F
Safety
1.0 / 5.0
81 violent crimes/100K
C
Education
2.3 / 5.0
15.7% bachelor's degree or higher
South Mount Vernon experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 24°F in January while summers reach 70°F in July. The area gets 282 sunny days per year. Air quality is rated Good with a median AQI of 43.
Temperature
24°F Jan (-4°C)
70°F Jul (21°C)
| Annual Average | 48.5°F |
| 10% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 70°F (21°C) |
| Sunny Days | 282 days/yr |
Geography
| Elevation | 1,018 ft (310 m) |
| Area | 0.5 sq mi (1.3 km²) |
| Population Density | 1,404/sq mi |
| Coordinates | 40.3824°N, 82.5019°W |
| Timezone | America/New_York |
| County | Knox County County |
| Nearest Airport | Mansfield Lahm Regional (MFD) 30 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0462 ppm |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 61.0 / 100 |
| Social Vulnerability | 62.7 / 100 |
| Community Resilience | 80.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-4°C) | 2.3 in | Coldest |
| February | 28°F (-3°C) | 2.2 in | Driest |
| March | 38°F (3°C) | 3.3 in | |
| April | 48°F (9°C) | 3.6 in | |
| May | 58°F (15°C) | 4.2 in | |
| June | 67°F (20°C) | 4.1 in | |
| July | 70°F (21°C) | 4.3 in | Warmest, Wettest |
| August | 70°F (21°C) | 3.7 in | |
| September | 63°F (17°C) | 3.4 in | |
| October | 52°F (11°C) | 2.5 in | |
| November | 41°F (5°C) | 3.4 in | |
| December | 31°F (-1°C) | 3.0 in |
South Mount Vernon has a seasonal temperature swing of 46°F / from 24°F in January to 70°F in July. Total annual precipitation is 40.0 inches, with July being the wettest month (4.3") and February the driest (2.2").