Chillicothe, IL
Full City Profile · Illinois · Peoria County County
3.2
/5.0
B
Good
6,185
Population
1,174/sq mi density
$62,108
Median Income
$37,620 per capita
$128,500
Home Value
$188,469 Zillow
$798
Median Rent
33.6% income on rent
53°F
Avg Temperature
152
Violent Crime/100K
961 property/100K
B
Overall
3.2 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.6 / 5.0
$62,108 median income, 5.7% unemployment
A+
Affordability
5.0 / 5.0
$128,500 home value, $798/mo rent
F
Safety
1.0 / 5.0
152 violent crimes/100K
B
Education
3.1 / 5.0
26.1% bachelor's degree or higher
Chillicothe experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 26°F in January while summers reach 76°F in July. Annual precipitation totals 36.4 inches. The area receives 20.0 inches of snow annually. Air quality is rated Good with a median AQI of 44.
Temperature
26°F Jan (-3°C)
76°F Jul (24°C)
| Annual Average | 52.6°F |
| 3% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 76°F (24°C) |
Geography
| Elevation | 535 ft (163 m) |
| Area | 5.3 sq mi (13.6 km²) |
| Population Density | 1,174/sq mi |
| Coordinates | 40.9160°N, 89.5027°W |
| Timezone | America/Chicago |
| County | Peoria County County |
| Nearest Airport | General Downing - Peoria International (PIA) 20 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 44.0 |
| Rating | Good |
| Good Days % | 68.6% |
| Unhealthy Days | 0 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0489 ppm |
| PM2.5 (Fine Particles) | 8.6 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 90.7 / 100 |
| Social Vulnerability | 50.0 / 100 |
| Community Resilience | 93.6 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Relatively Moderate |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 2.1 in | Coldest |
| February | 30°F (-1°C) | 1.9 in | Driest |
| March | 41°F (5°C) | 2.6 in | |
| April | 53°F (12°C) | 3.9 in | |
| May | 63°F (17°C) | 5.0 in | Wettest |
| June | 73°F (23°C) | 3.5 in | |
| July | 76°F (24°C) | 3.5 in | Warmest |
| August | 74°F (24°C) | 3.5 in | |
| September | 67°F (20°C) | 2.9 in | |
| October | 55°F (13°C) | 2.8 in | |
| November | 42°F (6°C) | 2.6 in | |
| December | 31°F (-1°C) | 2.1 in |
Chillicothe has a seasonal temperature swing of 50°F / from 26°F in January to 76°F in July. Total annual precipitation is 36.4 inches, with May being the wettest month (5.0") and February the driest (1.9").