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Lannon, WI
Full City Profile · Wisconsin · Waukesha County County
3.7
/5.0
B+
Good
1,475
Population
597/sq mi density
$79,191
Median Income
$56,946 per capita
$255,900
Home Value
$499,237 Zillow
47°F
Avg Temperature
260 sunny days/yr
22
Violent Crime/100K
1,231 property/100K
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.6 / 5.0
$79,191 median income, 1.2% unemployment
A+
Affordability
4.9 / 5.0
$255,900 home value, /mo rent
F
Safety
1.0 / 5.0
22 violent crimes/100K
A
Education
4.5 / 5.0
43.4% bachelor's degree or higher
Lannon 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. The area gets 260 sunny days per year. Annual precipitation totals 36.8 inches. Air quality is rated Good with a median AQI of 38.
Temperature
19°F Jan (-7°C)
72°F Jul (22°C)
| Annual Average | 46.5°F |
| 14% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 889 ft (271 m) |
| Area | 2.5 sq mi (6.4 km²) |
| Population Density | 597/sq mi |
| Coordinates | 43.1572°N, 88.1582°W |
| Timezone | America/Chicago |
| County | Waukesha County County |
| Nearest Airport | General Mitchell International (MKE) 20 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 | 19°F (-7°C) | 1.4 in | Coldest |
| February | 24°F (-5°C) | 1.1 in | Driest |
| March | 34°F (1°C) | 2.1 in | |
| April | 45°F (7°C) | 3.2 in | |
| May | 57°F (14°C) | 2.9 in | |
| June | 66°F (19°C) | 3.6 in | |
| July | 72°F (22°C) | 3.7 in | Warmest |
| August | 70°F (21°C) | 3.9 in | Wettest |
| September | 62°F (17°C) | 3.8 in | |
| October | 50°F (10°C) | 2.4 in | |
| November | 37°F (3°C) | 2.4 in | |
| December | 25°F (-4°C) | 1.9 in |
Lannon has a seasonal temperature swing of 53°F / from 19°F in January to 72°F in July. Total annual precipitation is 32.4 inches, with August being the wettest month (3.9") and February the driest (1.1").