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Naperville, IL
Full City Profile · Illinois · DuPage County County
3.9
/5.0
B+
Good
149,424
Population
3,797/sq mi density
$150,937
Median Income
$71,011 per capita
$509,900
Home Value
$594,498 Zillow
$1,852
Median Rent
24.3% income on rent
52°F
Avg Temperature
270 sunny days/yr
78
Violent Crime/100K
1,123 property/100K
B+
Overall
3.9 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.9 / 5.0
$150,937 median income, 2.9% unemployment
A+
Affordability
4.8 / 5.0
$509,900 home value, $1,852/mo rent
F
Safety
1.0 / 5.0
78 violent crimes/100K
A+
Education
5.0 / 5.0
71.7% bachelor's degree or higher
Naperville experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 31°F in January while summers reach 73°F in July. The area gets 270 sunny days per year. Annual precipitation totals 44.5 inches. The area receives 19.0 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
31°F Jan (-1°C)
73°F Jul (23°C)
| Annual Average | 52.3°F |
| 3% below US avg | |
| January Average | 31°F (-1°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 270 days/yr |
Geography
| Elevation | 715 ft (218 m) |
| Area | 38.8 sq mi (100.4 km²) |
| Population Density | 3,797/sq mi |
| Coordinates | 41.7492°N, 88.1620°W |
| Timezone | America/Chicago |
| County | DuPage County County |
| Nearest Airport | Joliet Regional (JOT) 16 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0475 ppm |
| PM2.5 (Fine Particles) | 10.1 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.7 / 100 |
| Social Vulnerability | 15.8 / 100 |
| Community Resilience | 71.8 / 100 |
Hazard Breakdown
| Tornado | Very High |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Very High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Very Low |
| Cold Wave | Very High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 3.0 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1954 | MICHIGAN CITY, IN (LAKE MICHIGAN) | Avalanche | 3.0 m | 7 | 106 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 1.6 in | |
| February | 27°F (-3°C) | 1.5 in | Coldest, Driest |
| March | 38°F (3°C) | 2.6 in | |
| April | 49°F (9°C) | 3.8 in | |
| May | 60°F (16°C) | 3.8 in | |
| June | 70°F (21°C) | 4.1 in | Wettest |
| July | 73°F (23°C) | 3.9 in | Warmest |
| August | 72°F (22°C) | 4.1 in | |
| September | 65°F (18°C) | 3.7 in | |
| October | 53°F (11°C) | 2.7 in | |
| November | 40°F (4°C) | 3.1 in | |
| December | 27°F (-3°C) | 2.4 in |
Naperville has a seasonal temperature swing of 46°F / from 27°F in February to 73°F in July. Total annual precipitation is 37.1 inches, with June being the wettest month (4.1") and February the driest (1.5").