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Chapin, IL
Full City Profile · Illinois · Scott County County
3.6
/5.0
B+
Good
618
Population
618/sq mi density
$69,213
Median Income
$34,505 per capita
$83,800
Home Value
$98,242 Zillow
$945
Median Rent
14.3% income on rent
53°F
Avg Temperature
293 sunny days/yr
B+
Overall
3.6 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.3 / 5.0
$69,213 median income, 2.4% unemployment
A+
Affordability
5.0 / 5.0
$83,800 home value, $945/mo rent
C+
Safety
2.5 / 5.0
0 violent crimes/100K
C
Education
2.5 / 5.0
18.4% bachelor's degree or higher
Chapin experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 27°F in January while summers reach 76°F in July. The area gets 293 sunny days per year. Annual precipitation totals 40.4 inches. Air quality is rated Good with a median AQI of 43.
Temperature
27°F Jan (-3°C)
76°F Jul (24°C)
| Annual Average | 52.9°F |
| 2% below US avg | |
| January Average | 27°F (-3°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 293 days/yr |
Geography
| Elevation | 623 ft (190 m) |
| Area | 0.4 sq mi (1.0 km²) |
| Population Density | 618/sq mi |
| Coordinates | 39.7669°N, 90.4027°W |
| Timezone | America/Chicago |
| County | Scott County County |
| Nearest Airport | Quincy Regional-Baldwin Field (UIN) 44 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 43.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very Low |
| Risk Score | 2.8 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 82.8 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Very Low |
| Winter Weather | Very Low |
| Lightning | Very Low |
| Ice Storm | Very Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 27°F (-3°C) | 1.5 in | Coldest, Driest |
| February | 30°F (-1°C) | 1.7 in | |
| March | 42°F (5°C) | 3.1 in | |
| April | 53°F (12°C) | 3.8 in | |
| May | 63°F (17°C) | 4.6 in | Wettest |
| June | 72°F (22°C) | 3.9 in | |
| July | 76°F (24°C) | 3.7 in | Warmest |
| August | 74°F (23°C) | 3.3 in | |
| September | 67°F (19°C) | 3.5 in | |
| October | 55°F (13°C) | 2.8 in | |
| November | 42°F (6°C) | 3.2 in | |
| December | 30°F (-1°C) | 2.5 in |
Chapin has a seasonal temperature swing of 49°F / from 27°F in January to 76°F in July. Total annual precipitation is 37.6 inches, with May being the wettest month (4.6") and January the driest (1.5").