Union Grove, WI
Full City Profile · Wisconsin · Walworth County County
4.5
/5.0
A+
Excellent
4,968
Population
1,918/sq mi density
$94,621
Median Income
$38,398 per capita
$258,100
Home Value
$341,532 Zillow
$1,051
Median Rent
19.1% income on rent
46°F
Avg Temperature
A+
Overall
4.5 / 5.0
Strong
A+
Economy
4.7 / 5.0
$94,621 median income, 1.2% unemployment
A+
Affordability
5.0 / 5.0
$258,100 home value, $1,051/mo rent
B+
Education
3.7 / 5.0
33.7% bachelor's degree or higher
Union Grove experiences four distinct seasons with an average annual temperature of 46°F (8°C). Winters average 20°F in January while summers reach 71°F in July. Annual precipitation totals 35.3 inches. The area receives 40.5 inches of snow annually. Air quality is rated Good with a median AQI of 42.
Temperature
20°F Jan (-7°C)
71°F Jul (22°C)
| Annual Average | 46.4°F |
| 14% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 71°F (22°C) |
Geography
| Elevation | 784 ft (239 m) |
| Area | 2.5 sq mi (6.4 km²) |
| Population Density | 1,918/sq mi |
| Coordinates | 42.6864°N, 88.0495°W |
| Timezone | America/Chicago |
| County | Walworth County County |
| Nearest Airport | Kenosha Regional (ENW) 9 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
| Good Days % | 82.0% |
| Unhealthy Days | 0 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0501 ppm |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 74.8 / 100 |
| Social Vulnerability | 20.8 / 100 |
| Community Resilience | 80.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively 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 | 146 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 1.8 in | Coldest |
| February | 24°F (-5°C) | 1.5 in | Driest |
| March | 34°F (1°C) | 2.1 in | |
| April | 45°F (7°C) | 3.5 in | |
| May | 56°F (13°C) | 4.1 in | |
| June | 66°F (19°C) | 4.5 in | Wettest |
| July | 71°F (22°C) | 3.5 in | Warmest |
| August | 69°F (20°C) | 3.8 in | |
| September | 61°F (16°C) | 3.4 in | |
| October | 49°F (10°C) | 2.9 in | |
| November | 37°F (3°C) | 2.4 in | |
| December | 26°F (-3°C) | 1.7 in |
Union Grove has a seasonal temperature swing of 51°F / from 20°F in January to 71°F in July. Total annual precipitation is 35.3 inches, with June being the wettest month (4.5") and February the driest (1.5").