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Fontana-on-Geneva Lake, WI
Full City Profile · Wisconsin · Walworth County County
3.7
/5.0
B+
Good
1,633
Population
486/sq mi density
$104,583
Median Income
$77,492 per capita
$555,800
Home Value
$391,861 Zillow
$1,338
Median Rent
28.6% income on rent
48°F
Avg Temperature
260 sunny days/yr
71
Violent Crime/100K
354 property/100K
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$104,583 median income, 2.0% unemployment
B+
Affordability
3.7 / 5.0
$555,800 home value, $1,338/mo rent
F
Safety
1.0 / 5.0
71 violent crimes/100K
A+
Education
5.0 / 5.0
58.9% bachelor's degree or higher
Fontana-on-Geneva Lake experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 21°F in January while summers reach 72°F in July. The area gets 260 sunny days per year. Annual precipitation totals 36.7 inches. Air quality is rated Good with a median AQI of 38.
Temperature
21°F Jan (-6°C)
72°F Jul (22°C)
| Annual Average | 47.6°F |
| 12% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 911 ft (278 m) |
| Area | 3.4 sq mi (8.7 km²) |
| Population Density | 486/sq mi |
| Coordinates | 42.5452°N, 88.5660°W |
| Timezone | America/Chicago |
| County | Walworth County County |
| Nearest Airport | Southern Wisconsin Regional (JVL) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
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)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 1.5 in | Coldest |
| February | 23°F (-5°C) | 1.2 in | Driest |
| March | 34°F (1°C) | 2.5 in | |
| April | 46°F (8°C) | 3.5 in | |
| May | 58°F (14°C) | 3.4 in | |
| June | 68°F (20°C) | 4.0 in | |
| July | 72°F (22°C) | 4.2 in | Warmest, Wettest |
| August | 70°F (21°C) | 4.1 in | |
| September | 62°F (17°C) | 3.9 in | |
| October | 50°F (10°C) | 2.6 in | |
| November | 37°F (3°C) | 2.6 in | |
| December | 24°F (-4°C) | 2.0 in |
Fontana-on-Geneva Lake has a seasonal temperature swing of 51°F / from 21°F in January to 72°F in July. Total annual precipitation is 35.5 inches, with July being the wettest month (4.2") and February the driest (1.2").