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Sussex, WI
Full City Profile · Wisconsin · Waukesha County County
3.9
/5.0
B+
Good
11,795
Population
1,396/sq mi density
$112,031
Median Income
$54,450 per capita
$384,900
Home Value
$491,671 Zillow
$1,231
Median Rent
25.5% income on rent
47°F
Avg Temperature
260 sunny days/yr
22
Violent Crime/100K
1,231 property/100K
B+
Overall
3.9 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.9 / 5.0
$112,031 median income, 2.8% unemployment
A+
Affordability
4.8 / 5.0
$384,900 home value, $1,231/mo rent
F
Safety
1.0 / 5.0
22 violent crimes/100K
A+
Education
4.8 / 5.0
48.1% bachelor's degree or higher
Sussex 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 | 950 ft (290 m) |
| Area | 8.5 sq mi (21.9 km²) |
| Population Density | 1,396/sq mi |
| Coordinates | 43.1349°N, 88.2260°W |
| Timezone | America/Chicago |
| County | Waukesha County County |
| Nearest Airport | General Mitchell International (MKE) 21 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) | 1.3 in | Coldest |
| February | 23°F (-5°C) | 1.1 in | Driest |
| March | 33°F (1°C) | 2.1 in | |
| April | 45°F (7°C) | 3.2 in | |
| May | 57°F (14°C) | 3.0 in | |
| June | 66°F (19°C) | 3.7 in | |
| July | 72°F (22°C) | 3.9 in | Warmest, Wettest |
| August | 69°F (21°C) | 3.9 in | |
| September | 61°F (16°C) | 3.9 in | |
| October | 50°F (10°C) | 2.5 in | |
| November | 36°F (2°C) | 2.4 in | |
| December | 24°F (-5°C) | 1.8 in |
Sussex has a seasonal temperature swing of 53°F / from 19°F in January to 72°F in July. Total annual precipitation is 32.7 inches, with July being the wettest month (3.9") and February the driest (1.1").