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Viola, IL
Full City Profile · Illinois · Mercer County County
3.7
/5.0
B+
Good
942
Population
1,121/sq mi density
$67,500
Median Income
$36,915 per capita
$114,500
Home Value
$168,554 Zillow
$692
Median Rent
21.8% income on rent
50°F
Avg Temperature
275 sunny days/yr
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.7 / 5.0
$67,500 median income, 5.1% unemployment
A+
Affordability
5.0 / 5.0
$114,500 home value, $692/mo rent
C+
Education
2.5 / 5.0
19.3% bachelor's degree or higher
Viola experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 22°F in January while summers reach 74°F in July. The area gets 275 sunny days per year. Annual precipitation totals 39.1 inches. The area receives 21.8 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
22°F Jan (-5°C)
74°F Jul (23°C)
| Annual Average | 50.0°F |
| 7% below US avg | |
| January Average | 22°F (-5°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 784 ft (239 m) |
| Area | 0.3 sq mi (0.9 km²) |
| Population Density | 1,121/sq mi |
| Coordinates | 41.2053°N, 90.5862°W |
| Timezone | America/Chicago |
| County | Mercer County County |
| Nearest Airport | Quad Cities International (MLI) 17 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 8.8 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 85.7 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-5°C) | 1.4 in | Coldest |
| February | 26°F (-3°C) | 1.3 in | Driest |
| March | 38°F (3°C) | 2.7 in | |
| April | 50°F (10°C) | 3.8 in | |
| May | 62°F (16°C) | 4.0 in | |
| June | 71°F (22°C) | 4.3 in | |
| July | 74°F (23°C) | 4.5 in | Warmest, Wettest |
| August | 72°F (22°C) | 4.1 in | |
| September | 64°F (18°C) | 3.7 in | |
| October | 53°F (12°C) | 2.8 in | |
| November | 39°F (4°C) | 2.5 in | |
| December | 26°F (-3°C) | 2.1 in |
Viola has a seasonal temperature swing of 52°F / from 22°F in January to 74°F in July. Total annual precipitation is 37.1 inches, with July being the wettest month (4.5") and February the driest (1.3").