Prairie du Rocher, IL
Full City Profile · Illinois · Monroe County County
3.6
/5.0
B+
Good
432
Population
758/sq mi density
$60,313
Median Income
$29,588 per capita
$85,400
Home Value
$155,203 Zillow
$713
Median Rent
27.8% income on rent
56°F
Avg Temperature
B+
Overall
3.6 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.8 / 5.0
$60,313 median income, 3.9% unemployment
A+
Affordability
5.0 / 5.0
$85,400 home value, $713/mo rent
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 79°F in July. Annual precipitation totals 42.8 inches. The area receives 4.3 inches of snow annually.
Temperature
32°F Jan (0°C)
79°F Jul (26°C)
| Annual Average | 56.4°F |
| 4% above US avg | |
| January Average | 32°F (0°C) |
| July Average | 79°F (26°C) |
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
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) | 2.7 in | Coldest |
| February | 37°F (3°C) | 2.4 in | Driest |
| March | 46°F (8°C) | 3.4 in | |
| April | 56°F (13°C) | 4.7 in | |
| May | 66°F (19°C) | 5.2 in | Wettest |
| June | 75°F (24°C) | 4.1 in | |
| July | 79°F (26°C) | 4.1 in | Warmest |
| August | 77°F (25°C) | 3.3 in | |
| September | 70°F (21°C) | 2.9 in | |
| October | 58°F (14°C) | 3.1 in | |
| November | 46°F (8°C) | 4.0 in | |
| December | 36°F (2°C) | 2.9 in |
Prairie du Rocher has a seasonal temperature swing of 47°F / from 32°F in January to 79°F in July. Total annual precipitation is 42.8 inches, with May being the wettest month (5.2") and February the driest (2.4").