Sullivan, WI
Full City Profile · Wisconsin · Jefferson County County
3.8
/5.0
B+
Good
711
Population
624/sq mi density
$82,500
Median Income
$37,391 per capita
$244,500
Home Value
$449,282 Zillow
$1,055
Median Rent
24.9% income on rent
47°F
Avg Temperature
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.9 / 5.0
$82,500 median income, 1.3% unemployment
A+
Affordability
5.0 / 5.0
$244,500 home value, $1,055/mo rent
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 19°F in January while summers reach 71°F in July. Annual precipitation totals 37.5 inches. The area receives 50.7 inches of snow annually. Air quality is rated Good with a median AQI of 39.
Temperature
19°F Jan (-7°C)
71°F Jul (22°C)
| Annual Average | 46.6°F |
| 14% below US avg | |
| January Average | 19°F (-7°C) |
| July Average | 71°F (22°C) |
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 | 39.0 |
| Rating | Good |
| Good Days % | 89.3% |
| Unhealthy Days | 0 |
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 | 19°F (-7°C) | 1.7 in | Coldest, Driest |
| February | 23°F (-5°C) | 1.8 in | |
| March | 34°F (1°C) | 2.1 in | |
| April | 46°F (8°C) | 3.9 in | |
| May | 57°F (14°C) | 4.3 in | |
| June | 67°F (20°C) | 4.9 in | Wettest |
| July | 71°F (22°C) | 4.1 in | Warmest |
| August | 69°F (21°C) | 4.0 in | |
| September | 62°F (17°C) | 3.5 in | |
| October | 50°F (10°C) | 3.0 in | |
| November | 37°F (3°C) | 2.4 in | |
| December | 25°F (-4°C) | 2.1 in |
Sullivan has a seasonal temperature swing of 52°F / from 19°F in January to 71°F in July. Total annual precipitation is 37.5 inches, with June being the wettest month (4.9") and January the driest (1.7").