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Big Rock, IL
Full City Profile · Illinois · Kane County County
3.7
/5.0
B+
Good
1,208
Population
280/sq mi density
$126,667
Median Income
$49,473 per capita
$290,100
Home Value
$400,867 Zillow
49°F
Avg Temperature
275 sunny days/yr
18
Violent Crime/100K
1,014 property/100K
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.9 / 5.0
$126,667 median income, 2.5% unemployment
A+
Affordability
5.0 / 5.0
$290,100 home value, /mo rent
F
Safety
1.0 / 5.0
18 violent crimes/100K
B+
Education
3.8 / 5.0
35.3% bachelor's degree or higher
Big Rock experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 21°F in January while summers reach 73°F in July. The area gets 275 sunny days per year. Annual precipitation totals 37.3 inches. The area receives 33.1 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
21°F Jan (-6°C)
73°F Jul (23°C)
| Annual Average | 48.6°F |
| 10% below US avg | |
| January Average | 21°F (-6°C) |
| July Average | 73°F (23°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 702 ft (214 m) |
| Area | 4.3 sq mi (11.2 km²) |
| Population Density | 280/sq mi |
| Coordinates | 41.7668°N, 88.5264°W |
| Timezone | America/Chicago |
| County | Kane County County |
| Nearest Airport | Joliet Regional (JOT) 25 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0494 ppm |
| PM2.5 (Fine Particles) | 9.8 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 94.6 / 100 |
| Social Vulnerability | 17.0 / 100 |
| Community Resilience | 63.7 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Very 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 | 137 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 21°F (-6°C) | 1.5 in | Coldest |
| February | 25°F (-4°C) | 1.3 in | Driest |
| March | 37°F (3°C) | 2.6 in | |
| April | 48°F (9°C) | 3.7 in | |
| May | 60°F (16°C) | 3.9 in | |
| June | 69°F (21°C) | 4.2 in | Wettest |
| July | 73°F (23°C) | 4.0 in | Warmest |
| August | 71°F (22°C) | 3.9 in | |
| September | 63°F (17°C) | 3.8 in | |
| October | 52°F (11°C) | 2.6 in | |
| November | 38°F (4°C) | 3.0 in | |
| December | 26°F (-3°C) | 2.2 in |
Big Rock has a seasonal temperature swing of 53°F / from 21°F in January to 73°F in July. Total annual precipitation is 36.7 inches, with June being the wettest month (4.2") and February the driest (1.3").