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Rockbridge, IL
Full City Profile · Illinois · Greene County County
3.5
/5.0
B+
Good
115
Population
155/sq mi density
$86,250
Median Income
$33,737 per capita
$91,900
Home Value
$129,647 Zillow
53°F
Avg Temperature
293 sunny days/yr
B+
Overall
3.5 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.7 / 5.0
$86,250 median income, 0.0% unemployment
A+
Affordability
5.0 / 5.0
$91,900 home value, /mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
D
Education
1.8 / 5.0
10.3% bachelor's degree or higher
Rockbridge experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 28°F in January while summers reach 76°F in July. The area gets 293 sunny days per year. Annual precipitation totals 42.2 inches. The area receives 12.5 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
28°F Jan (-2°C)
76°F Jul (25°C)
| Annual Average | 53.4°F |
| 1% below US avg | |
| January Average | 28°F (-2°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 540 ft (165 m) |
| Area | 0.3 sq mi (0.8 km²) |
| Population Density | 155/sq mi |
| Coordinates | 39.2693°N, 90.2066°W |
| Timezone | America/Chicago |
| County | Greene County County |
| Nearest Airport | St Louis Regional (ALN) 28 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 13.0 / 100 |
| Social Vulnerability | 27.4 / 100 |
| Community Resilience | 67.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 28°F (-2°C) | 1.7 in | Coldest, Driest |
| February | 32°F (-0°C) | 1.8 in | |
| March | 43°F (6°C) | 3.3 in | |
| April | 54°F (12°C) | 3.7 in | |
| May | 64°F (18°C) | 4.3 in | Wettest |
| June | 73°F (23°C) | 3.5 in | |
| July | 76°F (25°C) | 3.7 in | Warmest |
| August | 75°F (24°C) | 3.4 in | |
| September | 68°F (20°C) | 3.4 in | |
| October | 56°F (13°C) | 2.8 in | |
| November | 43°F (6°C) | 3.2 in | |
| December | 32°F (-0°C) | 2.8 in |
Rockbridge has a seasonal temperature swing of 48°F / from 28°F in January to 76°F in July. Total annual precipitation is 37.5 inches, with May being the wettest month (4.3") and January the driest (1.7").