Illiopolis, IL
Full City Profile · Illinois · Christian County County
4.0
/5.0
A
Great
854
Population
1,256/sq mi density
$74,219
Median Income
$32,074 per capita
$96,500
Home Value
$143,794 Zillow
$675
Median Rent
17.0% income on rent
53°F
Avg Temperature
A
Overall
4.0 / 5.0
Strong
A+
Economy
4.5 / 5.0
$74,219 median income, 2.0% unemployment
A+
Affordability
5.0 / 5.0
$96,500 home value, $675/mo rent
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. Annual precipitation totals 38.6 inches. The area receives 18.7 inches of snow annually.
Temperature
27°F Jan (-3°C)
76°F Jul (24°C)
| Annual Average | 53.1°F |
| 2% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 76°F (24°C) |
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
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) | 2.1 in | Coldest |
| February | 32°F (-0°C) | 2.0 in | Driest |
| March | 42°F (6°C) | 2.5 in | |
| April | 53°F (12°C) | 3.7 in | |
| May | 64°F (18°C) | 5.0 in | Wettest |
| June | 73°F (23°C) | 4.3 in | |
| July | 76°F (24°C) | 4.4 in | Warmest |
| August | 74°F (23°C) | 3.1 in | |
| September | 67°F (19°C) | 3.2 in | |
| October | 55°F (13°C) | 3.4 in | |
| November | 43°F (6°C) | 2.9 in | |
| December | 32°F (0°C) | 2.1 in |
Illiopolis has a seasonal temperature swing of 48°F / from 27°F in January to 76°F in July. Total annual precipitation is 38.6 inches, with May being the wettest month (5.0") and February the driest (2.0").