Brookfield, IL
Full City Profile · Illinois · Cook County County
3.8
/5.0
B+
Good
19,235
Population
6,286/sq mi density
$108,429
Median Income
$50,616 per capita
$314,000
Home Value
$362,176 Zillow
$1,328
Median Rent
26.0% income on rent
52°F
Avg Temperature
93
Violent Crime/100K
644 property/100K
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$108,429 median income, 3.5% unemployment
A+
Affordability
5.0 / 5.0
$314,000 home value, $1,328/mo rent
F
Safety
1.0 / 5.0
93 violent crimes/100K
A
Education
4.3 / 5.0
41.8% bachelor's degree or higher
Brookfield 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 34.4 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 | 621 ft (189 m) |
| Area | 1.2 sq mi (3.1 km²) |
| Population Density | 6,286/sq mi |
| Coordinates | 41.8251°N, 87.8475°W |
| Timezone | America/Chicago |
| County | Cook County County |
| Nearest Airport | Chicago Midway International (MDW) 6 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 | 81 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 26°F (-3°C) | 1.5 in | Coldest |
| February | 30°F (-1°C) | 1.5 in | Driest |
| March | 40°F (4°C) | 1.9 in | |
| April | 51°F (10°C) | 3.6 in | |
| May | 62°F (16°C) | 4.1 in | Wettest |
| June | 72°F (22°C) | 4.0 in | |
| July | 76°F (25°C) | 3.6 in | Warmest |
| August | 75°F (24°C) | 4.0 in | |
| September | 68°F (20°C) | 2.8 in | |
| October | 55°F (13°C) | 3.5 in | |
| November | 42°F (6°C) | 2.4 in | |
| December | 31°F (-0°C) | 1.8 in |
Brookfield has a seasonal temperature swing of 50°F / from 26°F in January to 76°F in July. Total annual precipitation is 34.4 inches, with May being the wettest month (4.1") and February the driest (1.5").