Lenzburg, IL
Full City Profile · Illinois · St. Clair County County
3.3
/5.0
B
Good
513
Population
442/sq mi density
$44,722
Median Income
$25,688 per capita
$92,500
Home Value
$123,616 Zillow
$645
Median Rent
29.7% income on rent
58°F
Avg Temperature
B
Overall
3.3 / 5.0
Good overall score based on economy, affordability, safety and education
B
Economy
3.0 / 5.0
$44,722 median income, 4.5% unemployment
A+
Affordability
5.0 / 5.0
$92,500 home value, $645/mo rent
C
Education
2.0 / 5.0
12.9% bachelor's degree or higher
Lenzburg enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 34°F in January while summers reach 79°F in July. Annual precipitation totals 45.0 inches. The area receives 11.6 inches of snow annually.
Temperature
34°F Jan (1°C)
79°F Jul (26°C)
| Annual Average | 57.7°F |
| 7% above US avg | |
| January Average | 34°F (1°C) |
| July Average | 79°F (26°C) |
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
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 | 34°F (1°C) | 2.8 in | Coldest |
| February | 38°F (4°C) | 2.4 in | Driest |
| March | 48°F (9°C) | 3.6 in | |
| April | 58°F (15°C) | 4.9 in | |
| May | 68°F (20°C) | 4.9 in | |
| June | 76°F (24°C) | 5.2 in | Wettest |
| July | 79°F (26°C) | 4.8 in | Warmest |
| August | 77°F (25°C) | 3.3 in | |
| September | 70°F (21°C) | 3.4 in | |
| October | 60°F (15°C) | 3.0 in | |
| November | 48°F (9°C) | 3.8 in | |
| December | 37°F (3°C) | 2.9 in |
Lenzburg has a seasonal temperature swing of 45°F / from 34°F in January to 79°F in July. Total annual precipitation is 45.0 inches, with June being the wettest month (5.2") and February the driest (2.4").