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Rock City, IL
Full City Profile · Illinois · Stephenson County County
3.8
/5.0
B+
Good
378
Population
2,700/sq mi density
$70,000
Median Income
$27,446 per capita
$124,000
Home Value
$213,162 Zillow
$845
Median Rent
27.5% income on rent
49°F
Avg Temperature
260 sunny days/yr
B+
Overall
3.8 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.3 / 5.0
$70,000 median income, 2.7% unemployment
A+
Affordability
5.0 / 5.0
$124,000 home value, $845/mo rent
C
Education
2.0 / 5.0
12.9% bachelor's degree or higher
Rock City experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 22°F in January while summers reach 74°F in July. The area gets 260 sunny days per year. Annual precipitation totals 37.2 inches. The area receives 37.1 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
22°F Jan (-6°C)
74°F Jul (23°C)
| Annual Average | 49.4°F |
| 9% below US avg | |
| January Average | 22°F (-6°C) |
| July Average | 74°F (23°C) |
| Sunny Days | 260 days/yr |
Geography
| Elevation | 905 ft (276 m) |
| Area | 0.1 sq mi (0.2 km²) |
| Population Density | 2,700/sq mi |
| Coordinates | 42.4130°N, 89.4710°W |
| Timezone | America/Chicago |
| County | Stephenson County County |
| Nearest Airport | Chicago/Rockford International (RFD) 24 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 73.9 / 100 |
| Social Vulnerability | 56.7 / 100 |
| Community Resilience | 68.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 22°F (-6°C) | 1.2 in | Coldest |
| February | 22°F (-5°C) | 1.2 in | Driest |
| March | 34°F (1°C) | 2.3 in | |
| April | 47°F (8°C) | 3.3 in | |
| May | 59°F (15°C) | 3.7 in | |
| June | 68°F (20°C) | 4.3 in | Wettest |
| July | 74°F (23°C) | 3.8 in | Warmest |
| August | 70°F (21°C) | 4.1 in | |
| September | 62°F (17°C) | 3.8 in | |
| October | 50°F (10°C) | 2.6 in | |
| November | 36°F (2°C) | 2.4 in | |
| December | 23°F (-5°C) | 1.9 in |
Rock City has a seasonal temperature swing of 52°F / from 22°F in January to 74°F in July. Total annual precipitation is 34.5 inches, with June being the wettest month (4.3") and February the driest (1.2").