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Rio, IL
Full City Profile · Illinois · Mercer County County
3.0
/5.0
B
Good
210
Population
677/sq mi density
$62,917
Median Income
$29,852 per capita
$104,700
Home Value
$164,950 Zillow
$771
Median Rent
28.5% income on rent
49°F
Avg Temperature
275 sunny days/yr
400
Violent Crime/100K
3,282 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.8 / 5.0
$62,917 median income, 1.9% unemployment
A+
Affordability
5.0 / 5.0
$104,700 home value, $771/mo rent
F
Safety
1.0 / 5.0
400 violent crimes/100K (5% above avg)
C
Education
2.1 / 5.0
13.8% bachelor's degree or higher
Rio experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 21°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 39.4 inches. Air quality is rated Good with a median AQI of 43.
Temperature
21°F Jan (-6°C)
73°F Jul (23°C)
| Annual Average | 49.0°F |
| 9% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 779 ft (237 m) |
| Area | 0.1 sq mi (0.3 km²) |
| Population Density | 677/sq mi |
| Coordinates | 41.1093°N, 90.3988°W |
| Timezone | America/Chicago |
| County | Mercer County County |
| Nearest Airport | Quad Cities International (MLI) 24 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 | 21°F (-6°C) | 1.5 in | Coldest |
| February | 27°F (-3°C) | 1.4 in | Driest |
| March | 38°F (4°C) | 2.8 in | |
| April | 51°F (10°C) | 3.8 in | |
| May | 62°F (17°C) | 4.1 in | |
| June | 71°F (22°C) | 4.3 in | |
| July | 73°F (23°C) | 4.4 in | Warmest, Wettest |
| August | 72°F (22°C) | 4.0 in | |
| September | 65°F (18°C) | 3.8 in | |
| October | 53°F (12°C) | 2.9 in | |
| November | 39°F (4°C) | 2.6 in | |
| December | 27°F (-3°C) | 2.2 in |
Rio has a seasonal temperature swing of 51°F / from 21°F in January to 73°F in July. Total annual precipitation is 37.6 inches, with July being the wettest month (4.4") and February the driest (1.4").