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Knollwood, IL
Full City Profile · Illinois · Lake County County
4.1
/5.0
A
Great
1,907
Population
3,126/sq mi density
$133,452
Median Income
$45,205 per capita
$372,500
Home Value
$615,993 Zillow
$1,733
Median Rent
34.8% income on rent
48°F
Avg Temperature
261 sunny days/yr
10
Violent Crime/100K
750 property/100K
A
Overall
4.1 / 5.0
Strong
A+
Economy
4.9 / 5.0
$133,452 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$372,500 home value, $1,733/mo rent
D
Safety
1.7 / 5.0
10 violent crimes/100K
A+
Education
4.6 / 5.0
45.6% bachelor's degree or higher
Knollwood experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 23°F in January while summers reach 72°F in July. The area gets 261 sunny days per year. Air quality is rated Good with a median AQI of 43.
Temperature
23°F Jan (-5°C)
72°F Jul (22°C)
| Annual Average | 48.4°F |
| 10% below US avg | |
| January Average | 23°F (-5°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 261 days/yr |
Geography
| Elevation | 689 ft (210 m) |
| Area | 0.6 sq mi (1.6 km²) |
| Population Density | 3,126/sq mi |
| Coordinates | 42.2846°N, 87.8793°W |
| Timezone | America/Chicago |
| County | Lake County County |
| Nearest Airport | Chicago O'Hare International (ORD) 21 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0480 ppm |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.0 / 100 |
| Social Vulnerability | 14.1 / 100 |
| Community Resilience | 78.1 / 100 |
Hazard Breakdown
| Tornado | Very High |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Very High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Very High |
| Landslide | Very Low |
| Coastal Flood | 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 | 105 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 23°F (-5°C) | 1.7 in | Coldest |
| February | 26°F (-3°C) | 1.3 in | Driest |
| March | 36°F (2°C) | 2.5 in | |
| April | 47°F (8°C) | 3.5 in | |
| May | 58°F (14°C) | 3.4 in | |
| June | 67°F (20°C) | 3.7 in | |
| July | 72°F (22°C) | 3.7 in | Warmest |
| August | 71°F (22°C) | 4.1 in | Wettest |
| September | 63°F (17°C) | 3.7 in | |
| October | 52°F (11°C) | 2.4 in | |
| November | 39°F (4°C) | 2.6 in | |
| December | 27°F (-3°C) | 2.2 in |
Knollwood has a seasonal temperature swing of 50°F / from 23°F in January to 72°F in July. Total annual precipitation is 34.8 inches, with August being the wettest month (4.1") and February the driest (1.3").