St. Marys, OH
Full City Profile · Ohio · Auglaize County County
3.8
/5.0
B+
Good
8,319
Population
1,781/sq mi density
$72,056
Median Income
$32,205 per capita
$138,500
Home Value
$247,288 Zillow
$835
Median Rent
20.9% income on rent
51°F
Avg Temperature
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.4 / 5.0
$72,056 median income, 1.7% unemployment
A+
Affordability
5.0 / 5.0
$138,500 home value, $835/mo rent
C
Education
2.1 / 5.0
14.2% bachelor's degree or higher
St. Marys experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 26°F in January while summers reach 73°F in July. Annual precipitation totals 37.7 inches. The area receives 10.4 inches of snow annually.
Temperature
26°F Jan (-3°C)
73°F Jul (23°C)
| Annual Average | 51.4°F |
| 5% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 73°F (23°C) |
Geography
| Elevation | 873 ft (266 m) |
| Area | 4.6 sq mi (12.0 km²) |
| Population Density | 1,781/sq mi |
| Coordinates | 40.5476°N, 84.3923°W |
| Timezone | America/New_York |
| County | Auglaize County County |
| Nearest Airport | James M Cox Dayton International (DAY) 46 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 41.8 / 100 |
| Social Vulnerability | 25.1 / 100 |
| Community Resilience | 95.4 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | No Rating |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 2.4 in | Coldest |
| February | 30°F (-1°C) | 2.2 in | Driest |
| March | 39°F (4°C) | 2.7 in | |
| April | 51°F (11°C) | 3.4 in | |
| May | 62°F (17°C) | 4.1 in | |
| June | 71°F (21°C) | 4.3 in | |
| July | 73°F (23°C) | 4.4 in | Warmest, Wettest |
| August | 72°F (22°C) | 3.4 in | |
| September | 66°F (19°C) | 3.0 in | |
| October | 54°F (12°C) | 2.7 in | |
| November | 42°F (5°C) | 2.9 in | |
| December | 31°F (-0°C) | 2.3 in |
St. Marys has a seasonal temperature swing of 47°F / from 26°F in January to 73°F in July. Total annual precipitation is 37.7 inches, with July being the wettest month (4.4") and February the driest (2.2").