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Illiopolis, IL
Full City Profile · Illinois · Christian County County
3.6
/5.0
B+
Good
854
Population
1,256/sq mi density
$74,219
Median Income
$32,074 per capita
$96,500
Home Value
$137,496 Zillow
$675
Median Rent
17.0% income on rent
53°F
Avg Temperature
293 sunny days/yr
B+
Overall
3.6 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.5 / 5.0
$74,219 median income, 1.2% unemployment
A+
Affordability
5.0 / 5.0
$96,500 home value, $675/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
C
Education
2.5 / 5.0
18.4% bachelor's degree or higher
Illiopolis experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 27°F in January while summers reach 76°F in July. The area gets 293 sunny days per year. Annual precipitation totals 40.4 inches. The area receives 13.6 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
27°F Jan (-3°C)
76°F Jul (24°C)
| Annual Average | 53.0°F |
| 2% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 595 ft (181 m) |
| Area | 0.2 sq mi (0.5 km²) |
| Population Density | 1,256/sq mi |
| Coordinates | 39.8498°N, 89.2521°W |
| Timezone | America/Chicago |
| County | Christian County County |
| Nearest Airport | Central Il Regional/Bloomington-Normal (BMI) 47 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 54.0 / 100 |
| Social Vulnerability | 17.1 / 100 |
| Community Resilience | 85.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Relatively High |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 1.8 in | Coldest, Driest |
| February | 30°F (-1°C) | 1.8 in | |
| March | 41°F (5°C) | 3.2 in | |
| April | 53°F (12°C) | 3.7 in | |
| May | 64°F (18°C) | 4.4 in | Wettest |
| June | 72°F (22°C) | 4.0 in | |
| July | 76°F (24°C) | 4.0 in | Warmest |
| August | 74°F (23°C) | 3.7 in | |
| September | 67°F (19°C) | 3.2 in | |
| October | 55°F (13°C) | 2.8 in | |
| November | 42°F (6°C) | 3.0 in | |
| December | 31°F (-1°C) | 2.7 in |
Illiopolis has a seasonal temperature swing of 49°F / from 27°F in January to 76°F in July. Total annual precipitation is 38.2 inches, with May being the wettest month (4.4") and January the driest (1.8").