All Countries
St. Marys, OH
Full City Profile · Ohio · Auglaize County County
3.3
/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
275 sunny days/yr
12
Violent Crime/100K
999 property/100K
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.4 / 5.0
$72,056 median income, 1.3% unemployment
A+
Affordability
5.0 / 5.0
$138,500 home value, $835/mo rent
D
Safety
1.5 / 5.0
12 violent crimes/100K
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. The area gets 275 sunny days per year. Annual precipitation totals 41.2 inches. The area receives 18.5 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
26°F Jan (-3°C)
73°F Jul (23°C)
| Annual Average | 51.0°F |
| 6% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
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
| AQI Median | 43.0 |
| Rating | Good |
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) | 1.9 in | Coldest |
| February | 28°F (-2°C) | 1.8 in | Driest |
| March | 38°F (3°C) | 3.0 in | |
| April | 49°F (9°C) | 3.5 in | |
| May | 60°F (16°C) | 3.7 in | Wettest |
| June | 69°F (21°C) | 3.6 in | |
| July | 73°F (23°C) | 3.6 in | Warmest |
| August | 71°F (22°C) | 3.2 in | |
| September | 65°F (18°C) | 2.9 in | |
| October | 53°F (12°C) | 2.2 in | |
| November | 41°F (5°C) | 2.9 in | |
| December | 30°F (-1°C) | 2.6 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 34.7 inches, with May being the wettest month (3.7") and February the driest (1.8").