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Weather & Climate in Sublette, IL

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Sublette experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 20°F in January while summers reach 72°F in July. The area gets 282 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 923 feet.

Temperature

20°F Jan (-7°C) 72°F Jul (22°C)
Annual Average48.2°F
11% below US avg
January Average20°F (-7°C)
July Average72°F (22°C)
Sunny Days282 days/yr

Geography

Elevation923 ft (281 m)
Area1.6 sq mi (4.1 km²)
Population Density935/sq mi
Coordinates41.6430°N, 89.2289°W
TimezoneAmerica/Chicago
CountyLee County County
Nearest AirportIllinois Valley Regional-Walter A Duncan Field (VYS)
21 miles away

Precipitation & Snow

Wettest Month (Jun) 4.37"
Driest Month (Feb) 1.22"

Air Quality

AQI Median43.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Low
Risk Score54.4 / 100
Social Vulnerability23.2 / 100
Community Resilience82.7 / 100

Hazard Breakdown

Tornado Relatively Moderate
Hurricane Very Low
Earthquake Very Low
Wildfire Very Low
Flood Relatively Low
Hail Relatively Low
Strong Wind Relatively High
Heat Wave Very Low
Winter Weather Relatively Low
Lightning Relatively Low
Ice Storm Relatively Low
Drought Relatively Moderate
Cold Wave Relatively Moderate
Landslide Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

8 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 34 km 10 km
Feb 10, 2010 2 km NW of Lily Lake, Illinois M3.8 71 km 10 km
Sep 2, 1999 8 km W of Amboy, Illinois M3.5 19 km 5 km
Nov 4, 2013 1 km SSW of Lyons, Illinois M3.2 118 km 1 km
Jul 15, 2024 2 km WNW of Somonauk, Illinois M3.1 43 km 10 km
Mar 25, 2015 3 km WNW of Lake in the Hills, Illinois M2.9 94 km 6 km
Jun 10, 2013 4 km NNE of Virgil, Illinois M2.6 71 km 5 km
Mar 15, 2025 6 km W of Dwight, Illinois M2.6 87 km 5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

635 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 82 fatalities, 1,382 injuries.

Date Rating Distance Path Fatalities
Aug 28, 1990 EF5 73 km 16.4 mi 29
Apr 9, 2015 EF4 24 km 30.1 mi 2
Jul 13, 2004 EF4 94 km 9.6 mi 0
Mar 29, 1981 EF4 60 km 5.1 mi 0
Jun 29, 1979 EF4 84 km 5.4 mi 0
Apr 21, 1967 EF4 69 km 25.5 mi 24
Apr 21, 1967 EF4 97 km 8.8 mi 1
Apr 11, 1965 EF4 95 km 9.1 mi 6
Jun 20, 2021 EF3 87 km 17.6 mi 0
Feb 28, 2017 EF3 82 km 17.8 mi 0
Feb 28, 2017 EF3 42 km 11.5 mi 2
Jun 22, 2015 EF3 80 km 16.3 mi 0
Jun 5, 2010 EF3 73 km 8.6 mi 0
Jan 7, 2008 EF3 89 km 13.2 mi 0
Apr 20, 2004 EF3 44 km 15.8 mi 8
May 9, 1995 EF3 61 km 22.0 mi 0
Mar 27, 1991 EF3 94 km 15.0 mi 0
Mar 13, 1990 EF3 88 km 15.5 mi 0
Apr 27, 1984 EF3 76 km 9.0 mi 1
Aug 5, 1979 EF3 51 km 5.7 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

4 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (1,741 acres, 2019).

Year Name Acres Burned Distance
2019 UNNAMED 1,741 93 km
2019 UNNAMED 1,664 98 km
2021 MIDDLE GRANT CREEK 700 95 km
2017 UNNAMED 549 94 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 20°F (-7°C) 1.4 in Coldest
February 24°F (-4°C) 1.2 in Driest
March 36°F (2°C) 2.6 in
April 48°F (9°C) 3.7 in
May 60°F (16°C) 4.1 in
June 69°F (21°C) 4.4 in Wettest
July 72°F (22°C) 3.8 in Warmest
August 71°F (21°C) 4.1 in
September 64°F (18°C) 3.8 in
October 52°F (11°C) 2.7 in
November 38°F (3°C) 2.7 in
December 25°F (-4°C) 2.1 in

Sublette has a seasonal temperature swing of 52°F / from 20°F in January to 72°F in July. Total annual precipitation is 36.5 inches, with June being the wettest month (4.4") and February the driest (1.2").

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