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Chester, IL
Full City Profile · Illinois · Perry County County
2.9
/5.0
C+
Fair
6,830
Population
1,184/sq mi density
$74,673
Median Income
$24,523 per capita
$107,800
Home Value
$112,761 Zillow
$642
Median Rent
14.4% income on rent
56°F
Avg Temperature
305 sunny days/yr
122
Violent Crime/100K
268 property/100K
C+
Overall
2.9 / 5.0
Fair overall score based on economy, affordability, safety and education
A
Economy
4.1 / 5.0
$74,673 median income, 1.0% unemployment
A+
Affordability
5.0 / 5.0
$107,800 home value, $642/mo rent
F
Safety
1.0 / 5.0
122 violent crimes/100K
D
Education
1.6 / 5.0
7.8% bachelor's degree or higher
Chester enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 32°F in January while summers reach 79°F in July. The area gets 305 sunny days per year. Annual precipitation totals 42.8 inches. The area receives 4.3 inches of snow annually. Air quality is rated Good with a median AQI of 43.
Temperature
32°F Jan (0°C)
79°F Jul (26°C)
| Annual Average | 56.4°F |
| 4% above US avg | |
| January Average | 32°F (0°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 305 days/yr |
Geography
| Elevation | 568 ft (173 m) |
| Area | 5.8 sq mi (14.9 km²) |
| Population Density | 1,184/sq mi |
| Coordinates | 37.9258°N, 89.8277°W |
| Timezone | America/Chicago |
| County | Perry County County |
| Nearest Airport | Farmington Regional (FAM) 32 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0492 ppm |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 46.2 / 100 |
| Social Vulnerability | 14.4 / 100 |
| Community Resilience | 79.4 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Very Low |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Relatively Low |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 32°F (0°C) | 2.3 in | Coldest, Driest |
| February | 35°F (2°C) | 2.6 in | |
| March | 45°F (7°C) | 4.2 in | |
| April | 56°F (13°C) | 3.9 in | |
| May | 65°F (18°C) | 4.4 in | Wettest |
| June | 74°F (23°C) | 3.8 in | |
| July | 79°F (26°C) | 4.1 in | Warmest |
| August | 76°F (25°C) | 3.5 in | |
| September | 69°F (21°C) | 3.4 in | |
| October | 58°F (14°C) | 2.9 in | |
| November | 46°F (8°C) | 4.1 in | |
| December | 36°F (2°C) | 3.5 in |
Chester has a seasonal temperature swing of 47°F / from 32°F in January to 79°F in July. Total annual precipitation is 42.6 inches, with May being the wettest month (4.4") and January the driest (2.3").