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Darien, IL
Full City Profile · Illinois · Cook County County
3.9
/5.0
B+
Good
21,855
Population
3,542/sq mi density
$109,354
Median Income
$53,601 per capita
$386,400
Home Value
$439,380 Zillow
$1,671
Median Rent
28.5% income on rent
51°F
Avg Temperature
275 sunny days/yr
50
Violent Crime/100K
998 property/100K
B+
Overall
3.9 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.9 / 5.0
$109,354 median income, 2.6% unemployment
A+
Affordability
4.7 / 5.0
$386,400 home value, $1,671/mo rent
F
Safety
1.0 / 5.0
50 violent crimes/100K
A+
Education
5.0 / 5.0
51.7% bachelor's degree or higher
Darien experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 24°F in January while summers reach 77°F in July. The area gets 275 sunny days per year. Annual precipitation totals 41.4 inches. Air quality is rated Good with a median AQI of 43.
Temperature
24°F Jan (-5°C)
77°F Jul (25°C)
| Annual Average | 51.4°F |
| 5% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 762 ft (232 m) |
| Area | 6.3 sq mi (16.3 km²) |
| Population Density | 3,542/sq mi |
| Coordinates | 41.7457°N, 87.9815°W |
| Timezone | America/Chicago |
| County | Cook County County |
| Nearest Airport | Chicago Midway International (MDW) 12 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0460 ppm |
| NO₂ (Nitrogen Dioxide) | 20.6 ppb |
| SO₂ (Sulfur Dioxide) | 1.33 ppb |
| CO (Carbon Monoxide) | 0.29 ppm |
| PM2.5 (Fine Particles) | 10.1 μg/m³ |
Natural Hazard Risk
| Overall Risk | Very High |
| Risk Score | 100.0 / 100 |
| Social Vulnerability | 61.7 / 100 |
| Community Resilience | 73.3 / 100 |
Hazard Breakdown
| Tornado | Very High |
| Hurricane | Very Low |
| Earthquake | Relatively High |
| Wildfire | Very Low |
| Flood | Very High |
| Hail | Relatively High |
| Strong Wind | Very High |
| Heat Wave | Very High |
| Winter Weather | Very High |
| Lightning | Very High |
| Ice Storm | Very High |
| Drought | Very Low |
| Cold Wave | Very High |
| Landslide | Very Low |
| Coastal Flood | Relatively 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 | 91 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-5°C) | 1.7 in | Coldest |
| February | 27°F (-3°C) | 1.5 in | Driest |
| March | 38°F (3°C) | 2.6 in | |
| April | 49°F (9°C) | 3.8 in | |
| May | 60°F (15°C) | 3.7 in | |
| June | 69°F (21°C) | 4.1 in | Wettest |
| July | 77°F (25°C) | 3.8 in | Warmest |
| August | 72°F (22°C) | 4.0 in | |
| September | 64°F (18°C) | 3.6 in | |
| October | 53°F (12°C) | 2.7 in | |
| November | 40°F (4°C) | 3.1 in | |
| December | 28°F (-2°C) | 2.5 in |
Darien has a seasonal temperature swing of 53°F / from 24°F in January to 77°F in July. Total annual precipitation is 37.2 inches, with June being the wettest month (4.1") and February the driest (1.5").