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Prairie du Rocher, IL
Full City Profile · Illinois · Monroe County County
3.4
/5.0
B
Good
432
Population
758/sq mi density
$60,313
Median Income
$29,588 per capita
$85,400
Home Value
$152,609 Zillow
$713
Median Rent
27.8% income on rent
56°F
Avg Temperature
293 sunny days/yr
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.0 / 5.0
$60,313 median income, 3.0% unemployment
A+
Affordability
5.0 / 5.0
$85,400 home value, $713/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
C
Education
2.0 / 5.0
12.6% bachelor's degree or higher
Prairie du Rocher enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 32°F in January while summers reach 78°F in July. The area gets 293 sunny days per year. Annual precipitation totals 43.6 inches. The area receives 9.2 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
32°F Jan (-0°C)
78°F Jul (25°C)
| Annual Average | 55.7°F |
| 3% above US avg | |
| January Average | 32°F (-0°C) |
| July Average | 78°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 389 ft (119 m) |
| Area | 0.2 sq mi (0.6 km²) |
| Population Density | 758/sq mi |
| Coordinates | 38.0817°N, 90.0976°W |
| Timezone | America/Chicago |
| County | Monroe County County |
| Nearest Airport | Farmington Regional (FAM) 26 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 41.9 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 94.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 32°F (-0°C) | 2.1 in | Coldest, Driest |
| February | 35°F (2°C) | 2.4 in | |
| March | 45°F (7°C) | 3.9 in | |
| April | 56°F (13°C) | 3.7 in | |
| May | 65°F (18°C) | 4.2 in | Wettest |
| June | 74°F (23°C) | 3.5 in | |
| July | 78°F (25°C) | 3.9 in | Warmest |
| August | 76°F (25°C) | 3.5 in | |
| September | 69°F (21°C) | 3.5 in | |
| October | 58°F (14°C) | 3.0 in | |
| November | 46°F (8°C) | 3.8 in | |
| December | 35°F (2°C) | 3.4 in |
Prairie du Rocher has a seasonal temperature swing of 46°F / from 32°F in January to 78°F in July. Total annual precipitation is 40.8 inches, with May being the wettest month (4.2") and January the driest (2.1").