Lake Koshkonong, WI
Full City Profile · Wisconsin · Walworth County County
4.3
/5.0
A
Great
983
Population
70/sq mi density
$93,125
Median Income
$58,498 per capita
$334,300
Home Value
$208,266 Zillow
$1,167
Median Rent
23.3% income on rent
47°F
Avg Temperature
A
Overall
4.3 / 5.0
Strong
A+
Economy
4.8 / 5.0
$93,125 median income, 2.5% unemployment
A+
Affordability
4.7 / 5.0
$334,300 home value, $1,167/mo rent
B
Education
3.3 / 5.0
28.6% bachelor's degree or higher
Lake Koshkonong experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 19°F in January while summers reach 72°F in July. Annual precipitation totals 35.5 inches. The area receives 36.4 inches of snow annually. Air quality is rated Good with a median AQI of 42.
Temperature
19°F Jan (-7°C)
72°F Jul (22°C)
| Annual Average | 47.2°F |
| 13% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 72°F (22°C) |
Geography
| Elevation | 791 ft (241 m) |
| Area | 29.8 sq mi (77.3 km²) |
| Population Density | 70/sq mi |
| Coordinates | 42.8605°N, 88.9401°W |
| Timezone | America/Chicago |
| County | Walworth County County |
| Nearest Airport | Southern Wisconsin Regional (JVL) 17 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)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 19°F (-7°C) | 1.5 in | Coldest |
| February | 23°F (-5°C) | 1.4 in | Driest |
| March | 34°F (1°C) | 2.0 in | |
| April | 47°F (8°C) | 3.6 in | |
| May | 58°F (15°C) | 4.1 in | |
| June | 68°F (20°C) | 5.0 in | Wettest |
| July | 72°F (22°C) | 4.0 in | Warmest |
| August | 70°F (21°C) | 3.9 in | |
| September | 63°F (17°C) | 3.3 in | |
| October | 50°F (10°C) | 2.8 in | |
| November | 37°F (3°C) | 2.2 in | |
| December | 26°F (-4°C) | 1.7 in |
Lake Koshkonong has a seasonal temperature swing of 53°F / from 19°F in January to 72°F in July. Total annual precipitation is 35.5 inches, with June being the wettest month (5.0") and February the driest (1.4").