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Weather & Climate in Chapin, IL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
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, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 40.4 inches. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 623 feet.
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)
Earthquake History
9 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.4.
| Mar 2, 1990 | 9 km NW of Vernon, Illinois | M3.4 | 147 km | 0 km |
| Jan 29, 1993 | 7 km WNW of Brownstown, Illinois | M3.2 | 143 km | 5 km |
| Jul 1, 2017 | 9 km SSE of Mulberry Grove, Illinois | M3.1 | 144 km | 17 km |
| Feb 8, 2004 | 6 km SSW of Stoutsville, Missouri | M2.9 | 131 km | 5 km |
| Apr 29, 2022 | 1 km SSW of Peerless Park, Missouri | M2.8 | 138 km | 8 km |
| May 5, 2008 | 3 km SSE of Fenton, Missouri | M2.8 | 142 km | 19 km |
| Sep 5, 2015 | 5 km SE of High Ridge, Missouri | M2.7 | 149 km | 8 km |
| Sep 19, 2024 | 1 km S of Old Monroe, Missouri | M2.6 | 99 km | 2 km |
| Jan 15, 1998 | 1 km SSE of Fenton, Missouri | M2.5 | 141 km | 16 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
570 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 15 fatalities, 548 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 13, 1995 | EF4 | 68 km | 7.0 mi | 0 |
| Jun 14, 1957 | EF4 | 60 km | 4.3 mi | 2 |
| Apr 4, 2023 | EF3 | 63 km | 19.9 mi | 0 |
| Dec 1, 2018 | EF3 | 95 km | 12.5 mi | 0 |
| Apr 19, 2011 | EF3 | 61 km | 4.3 mi | 0 |
| Dec 31, 2010 | EF3 | 52 km | 3.6 mi | 0 |
| Aug 19, 2009 | EF3 | 75 km | 24.3 mi | 0 |
| May 10, 2003 | EF3 | 99 km | 17.5 mi | 0 |
| Jun 1, 1999 | EF3 | 80 km | 10.0 mi | 1 |
| May 13, 1995 | EF3 | 83 km | 25.0 mi | 0 |
| May 9, 1995 | EF3 | 59 km | 50.0 mi | 0 |
| May 1, 1983 | EF3 | 53 km | 4.0 mi | 0 |
| Jun 21, 1981 | EF3 | 55 km | 8.8 mi | 1 |
| Jul 26, 1978 | EF3 | 53 km | 8.9 mi | 0 |
| Aug 6, 1977 | EF3 | 60 km | 4.1 mi | 0 |
| Mar 20, 1976 | EF3 | 74 km | 8.8 mi | 0 |
| Jul 23, 1975 | EF3 | 87 km | 11.1 mi | 0 |
| Jul 23, 1975 | EF3 | 91 km | 14.0 mi | 2 |
| Sep 30, 1973 | EF3 | 68 km | 0.1 mi | 0 |
| May 15, 1968 | EF3 | 71 km | 12.6 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
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").