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Union Hill, IL
Full City Profile · Illinois · Grundy County County
3.9
/5.0
B+
Good
66
Population
943/sq mi density
$117,750
Median Income
$38,459 per capita
$154,200
Home Value
$254,432 Zillow
49°F
Avg Temperature
275 sunny days/yr
64
Violent Crime/100K
700 property/100K
B+
Overall
3.9 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$117,750 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$154,200 home value, /mo rent
F
Safety
1.0 / 5.0
64 violent crimes/100K
A+
Education
4.6 / 5.0
45.5% bachelor's degree or higher
Union Hill experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 22°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 37.7 inches. The area receives 23.3 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
22°F Jan (-5°C)
73°F Jul (23°C)
| Annual Average | 49.3°F |
| 9% below US avg | |
| January Average | 22°F (-5°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 617 ft (188 m) |
| Area | 0.1 sq mi (0.2 km²) |
| Population Density | 943/sq mi |
| Coordinates | 41.1078°N, 88.1460°W |
| Timezone | America/Chicago |
| County | Grundy County County |
| Nearest Airport | Joliet Regional (JOT) 28 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 66.5 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 99.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1954 | MICHIGAN CITY, IN (LAKE MICHIGAN) | Avalanche | 3.0 m | 7 | 124 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-5°C) | 1.5 in | Coldest |
| February | 27°F (-3°C) | 1.5 in | Driest |
| March | 38°F (3°C) | 2.8 in | |
| April | 50°F (10°C) | 3.7 in | |
| May | 61°F (16°C) | 4.0 in | Wettest |
| June | 71°F (21°C) | 4.0 in | |
| July | 73°F (23°C) | 3.9 in | Warmest |
| August | 72°F (22°C) | 3.5 in | |
| September | 65°F (18°C) | 3.5 in | |
| October | 53°F (12°C) | 2.7 in | |
| November | 40°F (5°C) | 3.0 in | |
| December | 28°F (-2°C) | 2.6 in |
Union Hill has a seasonal temperature swing of 51°F / from 22°F in January to 73°F in July. Total annual precipitation is 36.7 inches, with May being the wettest month (4.0") and February the driest (1.5").