Smithton, IL
Full City Profile · Illinois · St. Clair County County
4.1
/5.0
A
Great
3,512
Population
779/sq mi density
$114,453
Median Income
$48,873 per capita
$251,600
Home Value
$312,908 Zillow
$857
Median Rent
51.0% income on rent
58°F
Avg Temperature
A
Overall
4.1 / 5.0
Strong
A+
Economy
4.8 / 5.0
$114,453 median income, 3.3% unemployment
A+
Affordability
5.0 / 5.0
$251,600 home value, $857/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
A
Education
4.1 / 5.0
38.2% bachelor's degree or higher
Smithton 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 43.4 inches. The area receives 11.2 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 | 472 ft (144 m) |
| Area | 4.5 sq mi (11.7 km²) |
| Population Density | 779/sq mi |
| Coordinates | 38.4143°N, 89.9901°W |
| Timezone | America/Chicago |
| County | St. Clair County County |
| Nearest Airport | St Louis Lambert International (STL) 31 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) | 2.6 in | Coldest |
| February | 38°F (4°C) | 2.2 in | Driest |
| March | 48°F (9°C) | 3.4 in | |
| April | 58°F (15°C) | 4.9 in | |
| May | 68°F (20°C) | 5.1 in | Wettest |
| June | 76°F (24°C) | 4.6 in | |
| July | 79°F (26°C) | 4.0 in | Warmest |
| August | 77°F (25°C) | 3.9 in | |
| September | 70°F (21°C) | 3.4 in | |
| October | 60°F (15°C) | 3.1 in | |
| November | 48°F (9°C) | 3.6 in | |
| December | 37°F (3°C) | 2.6 in |
Smithton has a seasonal temperature swing of 45°F / from 34°F in January to 79°F in July. Total annual precipitation is 43.4 inches, with May being the wettest month (5.1") and February the driest (2.2").