Somonauk, IL
Full City Profile · Illinois · Kendall County County
3.7
/5.0
B+
Good
1,592
Population
637/sq mi density
$81,731
Median Income
$44,114 per capita
$221,500
Home Value
$330,164 Zillow
$883
Median Rent
33.8% income on rent
49°F
Avg Temperature
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.3 / 5.0
$81,731 median income, 4.1% unemployment
A+
Affordability
5.0 / 5.0
$221,500 home value, $883/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
C+
Education
2.8 / 5.0
22.7% bachelor's degree or higher
Somonauk experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 23°F in January while summers reach 73°F in July. Annual precipitation totals 33.8 inches. The area receives 29.8 inches of snow annually.
Temperature
23°F Jan (-5°C)
73°F Jul (23°C)
| Annual Average | 49.4°F |
| 9% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 73°F (23°C) |
Geography
| Elevation | 685 ft (209 m) |
| Area | 2.3 sq mi (6.0 km²) |
| Population Density | 637/sq mi |
| Coordinates | 41.6347°N, 88.6875°W |
| Timezone | America/Chicago |
| County | Kendall County County |
| Nearest Airport | Joliet Regional (JOT) 28 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 80.3 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 96.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 1.3 in | Coldest, Driest |
| February | 27°F (-3°C) | 1.4 in | |
| March | 38°F (3°C) | 2.2 in | |
| April | 49°F (9°C) | 3.6 in | |
| May | 60°F (16°C) | 4.1 in | Wettest |
| June | 70°F (21°C) | 4.0 in | |
| July | 73°F (23°C) | 3.7 in | Warmest |
| August | 71°F (22°C) | 3.4 in | |
| September | 64°F (18°C) | 3.0 in | |
| October | 52°F (11°C) | 3.2 in | |
| November | 39°F (4°C) | 2.3 in | |
| December | 28°F (-2°C) | 1.7 in |
Somonauk has a seasonal temperature swing of 51°F / from 23°F in January to 73°F in July. Total annual precipitation is 33.8 inches, with May being the wettest month (4.1") and January the driest (1.3").