All Countries
Dewey, IL
Full City Profile · Illinois · Champaign County County
3.0
/5.0
B
Good
71
Population
710/sq mi density
52°F
Avg Temperature
275 sunny days/yr
203
Violent Crime/100K
1,729 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
203 violent crimes/100K
A+
Education
5.0 / 5.0
0.0% bachelor's degree or higher
Dewey experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 25°F in January while summers reach 76°F in July. The area gets 275 sunny days per year. Annual precipitation totals 40.4 inches. Air quality is rated Good with a median AQI of 43.
Temperature
25°F Jan (-4°C)
76°F Jul (24°C)
| Annual Average | 52.3°F |
| 3% below US avg | |
| January Average | 25°F (-4°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 275 days/yr |
Geography
| Elevation | 731 ft (223 m) |
| Area | 0.1 sq mi (0.3 km²) |
| Population Density | 710/sq mi |
| Coordinates | 40.3193°N, 88.2834°W |
| Timezone | America/Chicago |
| County | Champaign County County |
| Nearest Airport | Central Il Regional/Bloomington-Normal (BMI) 35 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0442 ppm |
| SO₂ (Sulfur Dioxide) | 0.56 ppb |
| CO (Carbon Monoxide) | 0.11 ppm |
| PM2.5 (Fine Particles) | 8.2 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 90.5 / 100 |
| Social Vulnerability | 30.9 / 100 |
| Community Resilience | 86.3 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively High |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | Relatively High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 25°F (-4°C) | 1.8 in | Coldest |
| February | 28°F (-2°C) | 1.7 in | Driest |
| March | 40°F (4°C) | 3.1 in | |
| April | 51°F (11°C) | 3.7 in | |
| May | 62°F (17°C) | 4.2 in | |
| June | 71°F (22°C) | 3.9 in | |
| July | 76°F (24°C) | 4.3 in | Warmest, Wettest |
| August | 72°F (22°C) | 3.9 in | |
| September | 66°F (19°C) | 3.3 in | |
| October | 54°F (12°C) | 2.7 in | |
| November | 41°F (5°C) | 3.1 in | |
| December | 30°F (-1°C) | 2.8 in |
Dewey has a seasonal temperature swing of 51°F / from 25°F in January to 76°F in July. Total annual precipitation is 38.5 inches, with July being the wettest month (4.3") and February the driest (1.7").