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Deer Park, IL
Full City Profile · Illinois · McHenry County County
3.9
/5.0
B+
Good
3,711
Population
1,011/sq mi density
$160,750
Median Income
$92,302 per capita
$636,200
Home Value
$725,397 Zillow
$2,389
Median Rent
34.2% income on rent
48°F
Avg Temperature
246 sunny days/yr
30
Violent Crime/100K
1,541 property/100K
B+
Overall
3.9 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$160,750 median income, 1.2% unemployment
A
Affordability
4.5 / 5.0
$636,200 home value, $2,389/mo rent
F
Safety
1.0 / 5.0
30 violent crimes/100K
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 48°F (9°C). Winters average 21°F in January while summers reach 72°F in July. The area gets 246 sunny days per year. Annual precipitation totals 40.4 inches. The area receives 38.5 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
21°F Jan (-6°C)
72°F Jul (22°C)
| Annual Average | 48.0°F |
| 11% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 246 days/yr |
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 |
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 | 21°F (-6°C) | 1.6 in | Coldest |
| February | 26°F (-3°C) | 1.3 in | Driest |
| March | 37°F (3°C) | 2.5 in | |
| April | 48°F (9°C) | 3.6 in | |
| May | 59°F (15°C) | 3.5 in | |
| June | 69°F (20°C) | 4.0 in | |
| July | 72°F (22°C) | 3.9 in | Warmest |
| August | 71°F (22°C) | 4.2 in | Wettest |
| September | 64°F (18°C) | 3.7 in | |
| October | 52°F (11°C) | 2.5 in | |
| November | 39°F (4°C) | 2.9 in | |
| December | 27°F (-3°C) | 2.2 in |
Deer Park has a seasonal temperature swing of 51°F / from 21°F in January to 72°F in July. Total annual precipitation is 35.9 inches, with August being the wettest month (4.2") and February the driest (1.3").