Long Lake, IL
Full City Profile · Illinois · McHenry County County
3.6
/5.0
B+
Good
3,219
Population
2,728/sq mi density
$100,824
Median Income
$32,881 per capita
$185,400
Home Value
$262,745 Zillow
$1,529
Median Rent
23.8% income on rent
49°F
Avg Temperature
B+
Overall
3.6 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.5 / 5.0
$100,824 median income, 15.8% unemployment
A+
Affordability
5.0 / 5.0
$185,400 home value, $1,529/mo rent
C
Education
2.3 / 5.0
16.5% bachelor's degree or higher
Long Lake experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 22°F in January while summers reach 73°F in July. Annual precipitation totals 37.8 inches. The area receives 43.4 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
22°F Jan (-5°C)
73°F Jul (23°C)
| Annual Average | 48.6°F |
| 10% below US avg | |
| January Average | 22°F (-5°C) |
| July Average | 73°F (23°C) |
Geography
| Elevation | 764 ft (233 m) |
| Area | 1.6 sq mi (4.2 km²) |
| Population Density | 2,728/sq mi |
| Coordinates | 42.3721°N, 88.1273°W |
| Timezone | America/Chicago |
| County | McHenry County County |
| Nearest Airport | Kenosha Regional (ENW) 19 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 | 127 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-5°C) | 2.1 in | Coldest |
| February | 26°F (-4°C) | 1.9 in | Driest |
| March | 36°F (2°C) | 2.6 in | |
| April | 47°F (8°C) | 4.1 in | |
| May | 58°F (15°C) | 4.4 in | Wettest |
| June | 68°F (20°C) | 4.2 in | |
| July | 73°F (23°C) | 3.9 in | Warmest |
| August | 71°F (22°C) | 3.3 in | |
| September | 64°F (18°C) | 3.4 in | |
| October | 52°F (11°C) | 3.0 in | |
| November | 39°F (4°C) | 2.5 in | |
| December | 28°F (-2°C) | 2.3 in |
Long Lake has a seasonal temperature swing of 51°F / from 22°F in January to 73°F in July. Total annual precipitation is 37.8 inches, with May being the wettest month (4.4") and February the driest (1.9").