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Sullivan, WI
Full City Profile · Wisconsin · Jefferson County County
3.1
/5.0
B
Good
711
Population
624/sq mi density
$82,500
Median Income
$37,391 per capita
$244,500
Home Value
$417,300 Zillow
$1,055
Median Rent
24.9% income on rent
47°F
Avg Temperature
260 sunny days/yr
21
Violent Crime/100K
847 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.9 / 5.0
$82,500 median income, 0.9% unemployment
A+
Affordability
5.0 / 5.0
$244,500 home value, $1,055/mo rent
F
Safety
1.0 / 5.0
21 violent crimes/100K
C+
Education
2.6 / 5.0
19.8% bachelor's degree or higher
Sullivan experiences four distinct seasons with an average annual temperature of 47°F (8°C). Winters average 20°F in January while summers reach 72°F in July. The area gets 260 sunny days per year. Annual precipitation totals 36.8 inches. The area receives 39.6 inches of snow annually. Air quality is rated Good with a median AQI of 38.
Temperature
20°F Jan (-7°C)
72°F Jul (22°C)
| Annual Average | 47.2°F |
| 13% below US avg | |
| January Average | 20°F (-7°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 844 ft (257 m) |
| Area | 1.1 sq mi (3.0 km²) |
| Population Density | 624/sq mi |
| Coordinates | 43.0123°N, 88.5953°W |
| Timezone | America/Chicago |
| County | Jefferson County County |
| Nearest Airport | Southern Wisconsin Regional (JVL) 35 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 38.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0493 ppm |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 75.8 / 100 |
| Social Vulnerability | 19.8 / 100 |
| Community Resilience | 92.1 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| 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 | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 20°F (-7°C) | 1.2 in | Coldest |
| February | 22°F (-5°C) | 1.1 in | Driest |
| March | 34°F (1°C) | 2.1 in | |
| April | 46°F (8°C) | 3.1 in | |
| May | 58°F (14°C) | 3.1 in | |
| June | 67°F (19°C) | 3.8 in | |
| July | 72°F (22°C) | 4.1 in | Warmest, Wettest |
| August | 69°F (21°C) | 4.0 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) | 1.7 in |
Sullivan has a seasonal temperature swing of 52°F / from 20°F in January to 72°F in July. Total annual precipitation is 33.0 inches, with July being the wettest month (4.1") and February the driest (1.1").