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Dupo, IL
Full City Profile · Illinois · St. Louis city County
3.1
/5.0
B
Good
3,914
Population
612/sq mi density
$57,899
Median Income
$31,315 per capita
$109,000
Home Value
$121,358 Zillow
$932
Median Rent
28.9% income on rent
56°F
Avg Temperature
293 sunny days/yr
184
Violent Crime/100K
2,021 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
B+
Economy
3.8 / 5.0
$57,899 median income, 3.9% unemployment
A+
Affordability
5.0 / 5.0
$109,000 home value, $932/mo rent
F
Safety
1.0 / 5.0
184 violent crimes/100K
C+
Education
2.5 / 5.0
18.9% bachelor's degree or higher
Dupo enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 31°F in January while summers reach 79°F in July. The area gets 293 sunny days per year. Annual precipitation totals 42.8 inches. The area receives 13.8 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
31°F Jan (-0°C)
79°F Jul (26°C)
| Annual Average | 56.2°F |
| 4% above US avg | |
| January Average | 31°F (-0°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 404 ft (123 m) |
| Area | 2.4 sq mi (6.3 km²) |
| Population Density | 612/sq mi |
| Coordinates | 38.5161°N, 90.2176°W |
| Timezone | America/Chicago |
| County | St. Louis city County |
| Nearest Airport | St Louis Lambert International (STL) 18 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0419 ppm |
| NO₂ (Nitrogen Dioxide) | 15.1 ppb |
| SO₂ (Sulfur Dioxide) | 1.03 ppb |
| CO (Carbon Monoxide) | 0.28 ppm |
| PM2.5 (Fine Particles) | 10.1 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.7 / 100 |
| Social Vulnerability | 71.9 / 100 |
| Community Resilience | 61.0 / 100 |
Hazard Breakdown
| Tornado | Very High |
| Hurricane | Very Low |
| Earthquake | Relatively High |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Very High |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively High |
| Drought | No Rating |
| Cold Wave | Relatively Moderate |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 31°F (-0°C) | 2.0 in | Coldest, Driest |
| February | 35°F (2°C) | 2.2 in | |
| March | 45°F (7°C) | 3.5 in | |
| April | 56°F (13°C) | 3.7 in | |
| May | 66°F (19°C) | 4.1 in | Wettest |
| June | 75°F (24°C) | 3.6 in | |
| July | 79°F (26°C) | 3.7 in | Warmest |
| August | 77°F (25°C) | 3.2 in | |
| September | 70°F (21°C) | 3.3 in | |
| October | 58°F (15°C) | 2.8 in | |
| November | 46°F (8°C) | 3.5 in | |
| December | 34°F (1°C) | 3.0 in |
Dupo has a seasonal temperature swing of 47°F / from 31°F in January to 79°F in July. Total annual precipitation is 38.6 inches, with May being the wettest month (4.1") and January the driest (2.0").