Weather & Climate in Winslow, IL

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

Winslow 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 260 sunny days per year, above the national average. Annual precipitation totals 38.7 inches. The area receives 35.7 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 782 feet.

Temperature

20°F Jan (-7°C) 72°F Jul (22°C)

Annual Average	47.9°F
	11% below US avg
January Average	20°F (-7°C)
July Average	72°F (22°C)
Sunny Days	260 days/yr

Geography

Elevation	782 ft (238 m)
Area	0.5 sq mi (1.2 km²)
Population Density	817/sq mi
Coordinates	42.4930°N, 89.7949°W
Timezone	America/Chicago
County	Stephenson County County
Nearest Airport	Southern Wisconsin Regional (JVL) 39 miles away

Precipitation & Snow

Annual Rainfall 38.7"

2% above US avg

Snowfall 35.7"

Wettest Month (Aug) 4.13"

Driest Month (Feb) 1.10"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	73.9 / 100
Social Vulnerability	56.7 / 100
Community Resilience	68.6 / 100

Hazard Breakdown

Tornado	Relatively Moderate
Hurricane	Very Low
Earthquake	Very Low
Wildfire	Very Low
Flood	Relatively Moderate
Hail	Relatively Moderate
Strong Wind	Relatively High
Heat Wave	Relatively Low
Winter Weather	Relatively Low
Lightning	Relatively Low
Ice Storm	Relatively Moderate
Drought	Relatively Moderate
Cold Wave	Relatively Moderate
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	137 km	10 km
Feb 10, 2010	2 km NW of Lily Lake, Illinois	M3.8	122 km	10 km
Sep 2, 1999	8 km W of Amboy, Illinois	M3.5	91 km	5 km
Jul 15, 2024	2 km WNW of Somonauk, Illinois	M3.1	130 km	10 km
Mar 25, 2015	3 km WNW of Lake in the Hills, Illinois	M2.9	122 km	6 km
Jun 10, 2013	4 km NNE of Virgil, Illinois	M2.6	120 km	5 km

Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

549 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 46 fatalities, 995 injuries.

Date	Rating	Distance	Path	Fatalities
Jun 7, 1984	EF5	55 km	36.0 mi	9
Apr 9, 2015	EF4	83 km	30.1 mi	2
Jul 3, 1983	EF4	60 km	0.5 mi	0
Mar 29, 1981	EF4	91 km	5.1 mi	0
Apr 21, 1967	EF4	78 km	25.5 mi	24
Jun 16, 2014	EF3	60 km	1.0 mi	0
Jan 7, 2008	EF3	80 km	13.2 mi	0
Aug 18, 2005	EF3	56 km	18.6 mi	1
Jun 19, 1993	EF3	78 km	14.0 mi	0
Jun 17, 1992	EF3	48 km	16.0 mi	0
May 8, 1988	EF3	37 km	16.0 mi	0
Aug 5, 1979	EF3	56 km	5.7 mi	0
Jun 4, 1975	EF3	94 km	2.3 mi	0
Jun 20, 1974	EF3	69 km	10.6 mi	1
Sep 9, 1970	EF3	72 km	4.7 mi	0
Aug 2, 1967	EF3	76 km	0.1 mi	2
Apr 16, 1967	EF3	12 km	27.8 mi	0
Jan 24, 1967	EF3	37 km	24.9 mi	0
Jan 24, 1967	EF3	53 km	7.4 mi	0
Aug 16, 1963	EF3	90 km	9.6 mi	0

Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

Wildfire History

3 wildfires (100+ acres) recorded within 100 km. Largest: 2018 BADGER RX BURNS (659 acres, 2018).

Year	Name	Acres Burned	Distance
2018	2018 BADGER RX BURNS	659	98 km
2019	2019 BADGER RX BURNS	627	98 km
2009	COLD SPRINGS	552	24 km

Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	20°F (-7°C)	1.1 in	Coldest
February	22°F (-5°C)	1.1 in	Driest
March	34°F (1°C)	2.3 in
April	47°F (8°C)	3.2 in
May	59°F (15°C)	3.7 in
June	68°F (20°C)	4.1 in
July	72°F (22°C)	3.7 in	Warmest
August	70°F (21°C)	4.1 in	Wettest
September	62°F (17°C)	3.9 in
October	50°F (10°C)	2.6 in
November	36°F (2°C)	2.4 in
December	23°F (-5°C)	1.8 in

Winslow has a seasonal temperature swing of 52°F / from 20°F in January to 72°F in July. Total annual precipitation is 34.0 inches, with August being the wettest month (4.1") and February the driest (1.1").

View full profile of Winslow, IL →