Grafton, WI
Full City Profile · Wisconsin · Ozaukee County County
3.8
/5.0
B+
Good
12,274
Population
2,303/sq mi density
$88,634
Median Income
$46,937 per capita
$301,300
Home Value
$460,062 Zillow
$1,162
Median Rent
25.8% income on rent
48°F
Avg Temperature
78
Violent Crime/100K
618 property/100K
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$88,634 median income, 1.7% unemployment
A+
Affordability
4.8 / 5.0
$301,300 home value, $1,162/mo rent
F
Safety
1.0 / 5.0
78 violent crimes/100K
A+
Education
4.6 / 5.0
44.4% bachelor's degree or higher
Grafton experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 24°F in January while summers reach 72°F in July. Annual precipitation totals 35.5 inches. The area receives 42.3 inches of snow annually. Air quality is rated Good with a median AQI of 37.
Temperature
24°F Jan (-5°C)
72°F Jul (22°C)
| Annual Average | 47.8°F |
| 11% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 72°F (22°C) |
Geography
| Elevation | 763 ft (233 m) |
| Area | 5.3 sq mi (13.8 km²) |
| Population Density | 2,303/sq mi |
| Coordinates | 43.3207°N, 87.9476°W |
| Timezone | America/Chicago |
| County | Ozaukee County County |
| Nearest Airport | General Mitchell International (MKE) 26 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 37.0 |
| Rating | Good |
| Good Days % | 80.9% |
| Unhealthy Days | 9 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0492 ppm |
| PM2.5 (Fine Particles) | 8.2 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 50.3 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 100.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Very Low |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
| Coastal Flood | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-5°C) | 1.6 in | Coldest, Driest |
| February | 26°F (-3°C) | 1.7 in | |
| March | 35°F (1°C) | 2.1 in | |
| April | 45°F (7°C) | 3.9 in | |
| May | 56°F (13°C) | 4.0 in | |
| June | 66°F (19°C) | 4.5 in | Wettest |
| July | 72°F (22°C) | 3.6 in | Warmest |
| August | 70°F (21°C) | 3.8 in | |
| September | 63°F (17°C) | 3.2 in | |
| October | 52°F (11°C) | 3.0 in | |
| November | 39°F (4°C) | 2.2 in | |
| December | 28°F (-2°C) | 2.0 in |
Grafton has a seasonal temperature swing of 48°F / from 24°F in January to 72°F in July. Total annual precipitation is 35.5 inches, with June being the wettest month (4.5") and January the driest (1.6").