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St. Elmo, IL
Full City Profile · Illinois · Effingham County County
2.8
/5.0
C+
Fair
1,401
Population
947/sq mi density
$47,115
Median Income
$23,540 per capita
$80,300
Home Value
$163,092 Zillow
$759
Median Rent
27.8% income on rent
54°F
Avg Temperature
293 sunny days/yr
72
Violent Crime/100K
1,368 property/100K
C+
Overall
2.8 / 5.0
Fair overall score based on economy, affordability, safety and education
B
Economy
3.4 / 5.0
$47,115 median income, 2.4% unemployment
A+
Affordability
5.0 / 5.0
$80,300 home value, $759/mo rent
F
Safety
1.0 / 5.0
72 violent crimes/100K
D
Education
1.7 / 5.0
8.2% bachelor's degree or higher
St. Elmo experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 29°F in January while summers reach 77°F in July. The area gets 293 sunny days per year. Annual precipitation totals 44.0 inches. The area receives 14.6 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
29°F Jan (-2°C)
77°F Jul (25°C)
| Annual Average | 54.4°F |
| 1% above US avg | |
| January Average | 29°F (-2°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 613 ft (187 m) |
| Area | 0.5 sq mi (1.2 km²) |
| Population Density | 947/sq mi |
| Coordinates | 39.0218°N, 88.8514°W |
| Timezone | America/Chicago |
| County | Effingham County County |
| Nearest Airport | St Louis Regional (ALN) 65 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0488 ppm |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 53.8 / 100 |
| Social Vulnerability | 23.0 / 100 |
| Community Resilience | 95.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively 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 | 29°F (-2°C) | 2.1 in | Coldest, Driest |
| February | 32°F (-0°C) | 2.2 in | |
| March | 43°F (6°C) | 3.7 in | |
| April | 54°F (12°C) | 3.8 in | |
| May | 64°F (18°C) | 4.1 in | |
| June | 73°F (23°C) | 4.2 in | Wettest |
| July | 77°F (25°C) | 3.9 in | Warmest |
| August | 75°F (24°C) | 3.0 in | |
| September | 68°F (20°C) | 3.1 in | |
| October | 56°F (13°C) | 2.9 in | |
| November | 44°F (7°C) | 3.7 in | |
| December | 33°F (0°C) | 3.3 in |
St. Elmo has a seasonal temperature swing of 48°F / from 29°F in January to 77°F in July. Total annual precipitation is 39.8 inches, with June being the wettest month (4.2") and January the driest (2.1").