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Oconomowoc Lake, WI
Full City Profile · Wisconsin · Waukesha County County
4.0
/5.0
A
Great
699
Population
364/sq mi density
$250,001
Median Income
$140,311 per capita
$1,328,700
Home Value
$1,957,645 Zillow
47°F
Avg Temperature
260 sunny days/yr
A
Overall
4.0 / 5.0
Strong
A+
Economy
5.0 / 5.0
$250,001 median income, 0.8% unemployment
B+
Affordability
3.7 / 5.0
$1,328,700 home value, /mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
A+
Education
5.0 / 5.0
71.8% bachelor's degree or higher
Oconomowoc Lake experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 20°F in January while summers reach 71°F in July. The area gets 260 sunny days per year. Annual precipitation totals 36.0 inches. The area receives 36.9 inches of snow annually. Air quality is rated Good with a median AQI of 38.
Temperature
20°F Jan (-7°C)
71°F Jul (22°C)
| Annual Average | 46.6°F |
| 14% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 876 ft (267 m) |
| Area | 3.2 sq mi (8.4 km²) |
| Population Density | 364/sq mi |
| Coordinates | 43.1038°N, 88.4497°W |
| Timezone | America/Chicago |
| County | Waukesha County County |
| Nearest Airport | General Mitchell International (MKE) 30 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0501 ppm |
| PM2.5 (Fine Particles) | 10.4 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 88.9 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 97.4 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively High |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 1.3 in | Coldest |
| February | 22°F (-5°C) | 1.1 in | Driest |
| March | 33°F (1°C) | 2.2 in | |
| April | 45°F (7°C) | 3.1 in | |
| May | 57°F (14°C) | 3.0 in | |
| June | 66°F (19°C) | 3.7 in | |
| July | 71°F (22°C) | 4.0 in | Warmest, Wettest |
| August | 69°F (21°C) | 3.9 in | |
| September | 61°F (16°C) | 3.9 in | |
| October | 50°F (10°C) | 2.6 in | |
| November | 36°F (2°C) | 2.4 in | |
| December | 23°F (-5°C) | 1.8 in |
Oconomowoc Lake has a seasonal temperature swing of 51°F / from 20°F in January to 71°F in July. Total annual precipitation is 32.9 inches, with July being the wettest month (4.0") and February the driest (1.1").