Oak Brook, IL
Full City Profile · Illinois · Cook County County
3.4
/5.0
B
Good
8,028
Population
1,006/sq mi density
$171,123
Median Income
$95,915 per capita
$867,900
Home Value
$990,584 Zillow
$2,921
Median Rent
27.1% income on rent
52°F
Avg Temperature
62
Violent Crime/100K
6,326 property/100K
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.7 / 5.0
$171,123 median income, 9.7% unemployment
B+
Affordability
3.8 / 5.0
$867,900 home value, $2,921/mo rent
F
Safety
1.0 / 5.0
62 violent crimes/100K
A+
Education
5.0 / 5.0
67.1% bachelor's degree or higher
Oak Brook experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 26°F in January while summers reach 76°F in July. Annual precipitation totals 39.7 inches. The area receives 42.3 inches of snow annually. Air quality is rated Moderate with a median AQI of 54.
Temperature
26°F Jan (-3°C)
76°F Jul (25°C)
| Annual Average | 52.1°F |
| 4% below US avg | |
| January Average | 26°F (-3°C) |
| July Average | 76°F (25°C) |
Geography
| Elevation | 679 ft (207 m) |
| Area | 8.3 sq mi (21.4 km²) |
| Population Density | 1,006/sq mi |
| Coordinates | 41.8364°N, 87.9532°W |
| Timezone | America/Chicago |
| County | Cook County County |
| Nearest Airport | Chicago O'Hare International (ORD) 10 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 54.0 |
| Rating | Moderate |
| Good Days % | 35.8% |
| Unhealthy Days | 11 |
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 | 90 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 2.2 in | Coldest, Driest |
| February | 30°F (-1°C) | 2.3 in | |
| March | 40°F (4°C) | 2.5 in | |
| April | 51°F (10°C) | 3.8 in | |
| May | 62°F (16°C) | 4.2 in | |
| June | 72°F (22°C) | 4.1 in | |
| July | 76°F (25°C) | 4.0 in | Warmest |
| August | 75°F (24°C) | 4.6 in | Wettest |
| September | 68°F (20°C) | 3.5 in | |
| October | 55°F (13°C) | 3.4 in | |
| November | 42°F (6°C) | 2.8 in | |
| December | 31°F (-0°C) | 2.4 in |
Oak Brook has a seasonal temperature swing of 50°F / from 26°F in January to 76°F in July. Total annual precipitation is 39.7 inches, with August being the wettest month (4.6") and January the driest (2.2").