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Lenzburg, IL
Full City Profile · Illinois · St. Clair County County
3.2
/5.0
B
Good
513
Population
442/sq mi density
$44,722
Median Income
$25,688 per capita
$92,500
Home Value
$135,686 Zillow
$645
Median Rent
29.7% income on rent
55°F
Avg Temperature
293 sunny days/yr
B
Overall
3.2 / 5.0
Good overall score based on economy, affordability, safety and education
B
Economy
3.2 / 5.0
$44,722 median income, 3.0% unemployment
A+
Affordability
5.0 / 5.0
$92,500 home value, $645/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
C
Education
2.0 / 5.0
12.9% bachelor's degree or higher
Lenzburg experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 31°F in January while summers reach 77°F in July. The area gets 293 sunny days per year. Annual precipitation totals 45.6 inches. The area receives 10.6 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
31°F Jan (-1°C)
77°F Jul (25°C)
| Annual Average | 55.1°F |
| 2% above US avg | |
| January Average | 31°F (-1°C) |
| July Average | 77°F (25°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 442 ft (135 m) |
| Area | 0.5 sq mi (1.3 km²) |
| Population Density | 442/sq mi |
| Coordinates | 38.2864°N, 89.8178°W |
| Timezone | America/Chicago |
| County | St. Clair County County |
| Nearest Airport | St Louis Regional (ALN) 43 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0482 ppm |
| NO₂ (Nitrogen Dioxide) | 14.2 ppb |
| SO₂ (Sulfur Dioxide) | 1.12 ppb |
| PM2.5 (Fine Particles) | 10.5 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 94.9 / 100 |
| Social Vulnerability | 37.9 / 100 |
| Community Resilience | 74.9 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively High |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively High |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-1°C) | 2.2 in | Coldest, Driest |
| February | 35°F (1°C) | 2.5 in | |
| March | 45°F (7°C) | 3.8 in | |
| April | 55°F (13°C) | 3.9 in | |
| May | 65°F (18°C) | 4.3 in | Wettest |
| June | 74°F (23°C) | 3.7 in | |
| July | 77°F (25°C) | 3.9 in | Warmest |
| August | 76°F (25°C) | 3.2 in | |
| September | 69°F (21°C) | 3.3 in | |
| October | 58°F (14°C) | 3.0 in | |
| November | 46°F (8°C) | 3.6 in | |
| December | 35°F (2°C) | 3.1 in |
Lenzburg has a seasonal temperature swing of 46°F / from 31°F in January to 77°F in July. Total annual precipitation is 40.4 inches, with May being the wettest month (4.3") and January the driest (2.2").