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St. Henry, OH
Full City Profile · Ohio · Mercer County County
3.7
/5.0
B+
Good
2,812
Population
1,625/sq mi density
$113,629
Median Income
$40,631 per capita
$273,100
Home Value
$278,335 Zillow
$743
Median Rent
25.0% income on rent
50°F
Avg Temperature
275 sunny days/yr
22
Violent Crime/100K
1,078 property/100K
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$113,629 median income, 0.2% unemployment
A+
Affordability
5.0 / 5.0
$273,100 home value, $743/mo rent
F
Safety
1.0 / 5.0
22 violent crimes/100K
B+
Education
3.8 / 5.0
35.5% bachelor's degree or higher
St. Henry experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 25°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 39.9 inches. The area receives 19.4 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
25°F Jan (-4°C)
73°F Jul (23°C)
| Annual Average | 50.3°F |
| 7% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 965 ft (294 m) |
| Area | 1.7 sq mi (4.3 km²) |
| Population Density | 1,625/sq mi |
| Coordinates | 40.4203°N, 84.6315°W |
| Timezone | America/New_York |
| County | Mercer County County |
| Nearest Airport | James M Cox Dayton International (DAY) 42 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 31.7 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 96.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| 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 | 25°F (-4°C) | 2.0 in | Coldest |
| February | 28°F (-2°C) | 1.9 in | Driest |
| March | 38°F (4°C) | 3.0 in | |
| April | 49°F (10°C) | 3.6 in | |
| May | 60°F (16°C) | 3.7 in | |
| June | 69°F (21°C) | 3.7 in | |
| July | 73°F (23°C) | 3.8 in | Warmest, Wettest |
| August | 71°F (22°C) | 3.3 in | |
| September | 65°F (18°C) | 2.8 in | |
| October | 53°F (12°C) | 2.4 in | |
| November | 41°F (5°C) | 3.0 in | |
| December | 30°F (-1°C) | 2.7 in |
St. Henry has a seasonal temperature swing of 47°F / from 25°F in January to 73°F in July. Total annual precipitation is 35.9 inches, with July being the wettest month (3.8") and February the driest (1.9").