Weather & Climate in Williamsfield, IL
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Williamsfield experiences four distinct seasons with an average annual temperature of 51°F (10°C). Winters average 24°F in January while summers reach 74°F in July. Annual precipitation totals 37.7 inches. The area receives 21.3 inches of snow annually, a moderate snowfall amount. The city sits at an elevation of 703 feet.
Temperature
24°F Jan (-5°C)
74°F Jul (24°C)
| Annual Average | 50.8°F |
| 6% below US avg | |
| January Average | 24°F (-5°C) |
| July Average | 74°F (24°C) |
Geography
| Elevation | 703 ft (214 m) |
| Area | 0.5 sq mi (1.3 km²) |
| Population Density | 407/sq mi |
| Coordinates | 40.9264°N, 90.0182°W |
| Timezone | America/Chicago |
| County | Knox County County |
| Nearest Airport | General Downing - Peoria International (PIA) 25 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 57.2 / 100 |
| Social Vulnerability | 49.8 / 100 |
| Community Resilience | 66.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Moderate |
| Strong Wind | Relatively High |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Moderate |
| Landslide | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
4 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.
| Jun 28, 2004 | 12 km NW of Dayton, Illinois | M4.2 | 111 km | 10 km |
| Sep 2, 1999 | 8 km W of Amboy, Illinois | M3.5 | 101 km | 5 km |
| Jul 15, 2024 | 2 km WNW of Somonauk, Illinois | M3.1 | 135 km | 10 km |
| Mar 15, 2025 | 6 km W of Dwight, Illinois | M2.6 | 129 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
678 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 20 fatalities, 553 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Nov 17, 2013 | EF4 | 51 km | 46.4 mi | 3 |
| Jul 13, 2004 | EF4 | 60 km | 9.6 mi | 0 |
| May 13, 1995 | EF4 | 66 km | 7.0 mi | 0 |
| Mar 29, 1981 | EF4 | 84 km | 5.1 mi | 0 |
| May 5, 1977 | EF4 | 99 km | 7.3 mi | 0 |
| Jun 29, 1976 | EF4 | 27 km | 4.9 mi | 0 |
| Apr 4, 2023 | EF3 | 71 km | 19.9 mi | 0 |
| Feb 28, 2017 | EF3 | 100 km | 11.5 mi | 2 |
| Feb 28, 2017 | EF3 | 55 km | 17.8 mi | 0 |
| Apr 20, 2004 | EF3 | 72 km | 15.8 mi | 8 |
| May 10, 2003 | EF3 | 58 km | 17.5 mi | 0 |
| Apr 19, 1996 | EF3 | 88 km | 9.4 mi | 0 |
| May 13, 1995 | EF3 | 57 km | 25.0 mi | 0 |
| May 9, 1995 | EF3 | 45 km | 22.0 mi | 0 |
| Mar 13, 1990 | EF3 | 78 km | 15.5 mi | 0 |
| Jun 21, 1981 | EF3 | 93 km | 8.8 mi | 1 |
| Aug 15, 1978 | EF3 | 74 km | 6.4 mi | 0 |
| Mar 4, 1976 | EF3 | 48 km | 0.8 mi | 0 |
| Jul 23, 1975 | EF3 | 42 km | 14.0 mi | 2 |
| Jul 23, 1975 | EF3 | 49 km | 11.1 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
5 wildfires (100+ acres) recorded within 100 km. Largest: UNIT 3 (1,206 acres, 1999).
| Year | Name | Acres Burned | Distance |
| 1999 | UNIT 3 | 1,206 | 92 km |
| 2002 | HSB 03 2 | 1,130 | 93 km |
| 2000 | DESTRUST A | 756 | 93 km |
| 2006 | HSB 003 | 674 | 92 km |
| 2004 | HSB 009 | 608 | 93 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 24°F (-5°C) | 2.0 in | Coldest |
| February | 28°F (-2°C) | 1.9 in | |
| March | 39°F (4°C) | 2.5 in | |
| April | 51°F (11°C) | 3.5 in | |
| May | 63°F (17°C) | 4.7 in | Wettest |
| June | 72°F (22°C) | 4.4 in | |
| July | 74°F (24°C) | 4.3 in | Warmest |
| August | 72°F (22°C) | 3.7 in | |
| September | 65°F (18°C) | 4.0 in | |
| October | 53°F (12°C) | 2.7 in | |
| November | 40°F (5°C) | 2.4 in | |
| December | 29°F (-2°C) | 1.9 in | Driest |
Williamsfield has a seasonal temperature swing of 51°F / from 24°F in January to 74°F in July. Total annual precipitation is 37.7 inches, with May being the wettest month (4.7") and December the driest (1.9").