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Mill Creek, IL
Full City Profile · Illinois · Union County County
2.4
/5.0
C
Fair
32
Population
84/sq mi density
$107,500
Median Income
$34,413 per capita
59°F
Avg Temperature
299 sunny days/yr
320
Violent Crime/100K
4,280 property/100K
C
Overall
2.4 / 5.0
Fair overall score based on economy, affordability, safety and education
C+
Economy
2.8 / 5.0
$107,500 median income, 20.0% unemployment
F
Safety
1.0 / 5.0
320 violent crimes/100K
B
Education
3.3 / 5.0
29.2% bachelor's degree or higher
Mill Creek enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 35°F in January while summers reach 79°F in July. The area gets 299 sunny days per year. Annual precipitation totals 51.1 inches. The area receives 10.4 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
35°F Jan (2°C)
79°F Jul (26°C)
| Annual Average | 58.5°F |
| 8% above US avg | |
| January Average | 35°F (2°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 299 days/yr |
Geography
| Elevation | 377 ft (115 m) |
| Area | 0.2 sq mi (0.4 km²) |
| Population Density | 84/sq mi |
| Coordinates | 37.3409°N, 89.2531°W |
| Timezone | America/Chicago |
| County | Union County County |
| Nearest Airport | Cairo Regional (CIR) 19 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 55.4 / 100 |
| Social Vulnerability | 68.5 / 100 |
| Community Resilience | 56.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 35°F (2°C) | 3.1 in | Coldest, Driest |
| February | 36°F (2°C) | 3.4 in | |
| March | 46°F (8°C) | 4.8 in | |
| April | 56°F (14°C) | 4.6 in | |
| May | 65°F (19°C) | 5.0 in | Wettest |
| June | 74°F (23°C) | 4.1 in | |
| July | 79°F (26°C) | 3.5 in | Warmest |
| August | 76°F (25°C) | 3.7 in | |
| September | 70°F (21°C) | 3.4 in | |
| October | 58°F (15°C) | 3.2 in | |
| November | 47°F (8°C) | 4.5 in | |
| December | 37°F (3°C) | 4.2 in |
Mill Creek has a seasonal temperature swing of 44°F / from 35°F in January to 79°F in July. Total annual precipitation is 47.3 inches, with May being the wettest month (5.0") and January the driest (3.1").