Union Hill, IL
Full City Profile · Illinois · Grundy County County
4.9
/5.0
A+
Excellent
66
Population
943/sq mi density
$117,750
Median Income
$38,459 per capita
$154,200
Home Value
$254,432 Zillow
51°F
Avg Temperature
A+
Overall
4.9 / 5.0
Strong
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
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 51°F (11°C). Winters average 24°F in January while summers reach 75°F in July. Annual precipitation totals 39.1 inches. The area receives 27.4 inches of snow annually.
Temperature
24°F Jan (-4°C)
75°F Jul (24°C)
| Annual Average | 51.2°F |
| 5% below US avg | |
| January Average | 24°F (-4°C) |
| July Average | 75°F (24°C) |
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
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 | 24°F (-4°C) | 2.3 in | Coldest |
| February | 28°F (-2°C) | 1.9 in | Driest |
| March | 39°F (4°C) | 2.6 in | |
| April | 50°F (10°C) | 3.9 in | |
| May | 62°F (17°C) | 4.5 in | |
| June | 72°F (22°C) | 4.6 in | Wettest |
| July | 75°F (24°C) | 4.1 in | Warmest |
| August | 73°F (23°C) | 3.6 in | |
| September | 67°F (19°C) | 3.2 in | |
| October | 54°F (12°C) | 3.2 in | |
| November | 41°F (5°C) | 2.7 in | |
| December | 30°F (-1°C) | 2.3 in |
Union Hill has a seasonal temperature swing of 50°F / from 24°F in January to 75°F in July. Total annual precipitation is 39.1 inches, with June being the wettest month (4.6") and February the driest (1.9").