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Weather & Climate in Neponset, IL

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

Neponset experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 22°F in January while summers reach 74°F in July. The area gets 275 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 39.6 inches. The area receives 30.8 inches of snow annually, a moderate snowfall amount. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 831 feet.

Temperature

22°F Jan (-6°C) 74°F Jul (23°C)
Annual Average49.6°F
8% below US avg
January Average22°F (-6°C)
July Average74°F (23°C)
Sunny Days275 days/yr

Geography

Elevation831 ft (253 m)
Area1.0 sq mi (2.6 km²)
Population Density411/sq mi
Coordinates41.2967°N, 89.7896°W
TimezoneAmerica/Chicago
CountyStark County County
Nearest AirportIllinois Valley Regional-Walter A Duncan Field (VYS)
33 miles away

Precipitation & Snow

Annual Rainfall 39.6"
4% above US avg
Snowfall 30.8"
Wettest Month (Jun) 4.33"
Driest Month (Feb) 1.34"

Air Quality

AQI Median43.0
RatingGood

Natural Hazard Risk

Overall RiskVery Low
Risk Score7.3 / 100
Social Vulnerability20.2 / 100
Community Resilience83.2 / 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 Relatively Low
Drought Relatively Moderate
Cold Wave Relatively Low
Landslide Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

6 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 76 km 10 km
Feb 10, 2010 2 km NW of Lily Lake, Illinois M3.8 131 km 10 km
Sep 2, 1999 8 km W of Amboy, Illinois M3.5 56 km 5 km
Jul 15, 2024 2 km WNW of Somonauk, Illinois M3.1 98 km 10 km
Jun 10, 2013 4 km NNE of Virgil, Illinois M2.6 131 km 5 km
Mar 15, 2025 6 km W of Dwight, Illinois M2.6 110 km 5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

657 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 21 fatalities, 478 injuries.

Date Rating Distance Path Fatalities
Apr 9, 2015 EF4 75 km 30.1 mi 2
Nov 17, 2013 EF4 77 km 46.4 mi 3
Jul 13, 2004 EF4 67 km 9.6 mi 0
Mar 29, 1981 EF4 45 km 5.1 mi 0
Jun 29, 1976 EF4 55 km 4.9 mi 0
Feb 28, 2017 EF3 70 km 11.5 mi 2
Feb 28, 2017 EF3 56 km 17.8 mi 0
Jun 5, 2010 EF3 91 km 8.6 mi 0
Apr 20, 2004 EF3 43 km 15.8 mi 8
May 10, 2003 EF3 92 km 17.5 mi 0
May 13, 1995 EF3 98 km 25.0 mi 0
May 9, 1995 EF3 1 km 22.0 mi 0
May 9, 1995 EF3 95 km 10.0 mi 0
Mar 13, 1990 EF3 53 km 15.5 mi 0
May 8, 1988 EF3 97 km 32.0 mi 0
Aug 5, 1979 EF3 82 km 5.7 mi 0
Aug 15, 1978 EF3 83 km 6.4 mi 0
Jun 30, 1977 EF3 73 km 6.1 mi 0
Mar 4, 1976 EF3 21 km 0.8 mi 0
Jul 23, 1975 EF3 87 km 14.0 mi 2
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 22°F (-6°C) 1.4 in Coldest
February 25°F (-4°C) 1.3 in Driest
March 37°F (3°C) 2.8 in
April 50°F (10°C) 3.8 in
May 61°F (16°C) 4.1 in
June 70°F (21°C) 4.3 in Wettest
July 74°F (23°C) 3.9 in Warmest
August 72°F (22°C) 4.0 in
September 64°F (18°C) 3.8 in
October 53°F (11°C) 2.8 in
November 39°F (4°C) 2.7 in
December 26°F (-3°C) 2.2 in

Neponset has a seasonal temperature swing of 52°F / from 22°F in January to 74°F in July. Total annual precipitation is 37.2 inches, with June being the wettest month (4.3") and February the driest (1.3").

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