Deer Park, IL
Full City Profile · Illinois · McHenry County County
4.8
/5.0
A+
Excellent
3,711
Population
1,011/sq mi density
$160,750
Median Income
$92,302 per capita
$636,200
Home Value
$781,384 Zillow
$2,389
Median Rent
34.2% income on rent
51°F
Avg Temperature
A+
Overall
4.8 / 5.0
Strong
A+
Economy
5.0 / 5.0
$160,750 median income, 2.0% unemployment
A
Affordability
4.5 / 5.0
$636,200 home value, $2,389/mo rent
A+
Education
5.0 / 5.0
71.9% bachelor's degree or higher
Deer Park experiences four distinct seasons with an average annual temperature of 51°F (11°C). Winters average 25°F in January while summers reach 75°F in July. Annual precipitation totals 32.3 inches. The area receives 38.5 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
25°F Jan (-4°C)
75°F Jul (24°C)
| Annual Average | 50.8°F |
| 6% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 75°F (24°C) |
Geography
| Elevation | 857 ft (261 m) |
| Area | 3.7 sq mi (9.5 km²) |
| Population Density | 1,011/sq mi |
| Coordinates | 42.1663°N, 88.0862°W |
| Timezone | America/Chicago |
| County | McHenry County County |
| Nearest Airport | Chicago O'Hare International (ORD) 16 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
| Good Days % | 66.9% |
| Unhealthy Days | 1 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0484 ppm |
| PM2.5 (Fine Particles) | 9.1 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 90.8 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 84.0 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Low |
| Drought | Relatively Low |
| Cold Wave | Relatively 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 | 112 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 1.3 in | Coldest |
| February | 29°F (-2°C) | 1.3 in | Driest |
| March | 38°F (4°C) | 1.8 in | |
| April | 49°F (9°C) | 3.3 in | |
| May | 60°F (15°C) | 3.8 in | |
| June | 70°F (21°C) | 4.0 in | Wettest |
| July | 75°F (24°C) | 3.2 in | Warmest |
| August | 73°F (23°C) | 3.7 in | |
| September | 66°F (19°C) | 3.0 in | |
| October | 54°F (12°C) | 3.1 in | |
| November | 41°F (5°C) | 2.2 in | |
| December | 30°F (-1°C) | 1.6 in |
Deer Park has a seasonal temperature swing of 50°F / from 25°F in January to 75°F in July. Total annual precipitation is 32.3 inches, with June being the wettest month (4.0") and February the driest (1.3").