Weather & Climate in Glencoe, IL

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

Glencoe experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 24°F in January while summers reach 73°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 39.5 inches. The area receives 33.6 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 670 feet.

Temperature

24°F Jan (-4°C) 73°F Jul (23°C)

Annual Average	49.6°F
	8% below US avg
January Average	24°F (-4°C)
July Average	73°F (23°C)
Sunny Days	260 days/yr

Geography

Elevation	670 ft (204 m)
Area	1.5 sq mi (3.8 km²)
Population Density	2,343/sq mi
Coordinates	42.1345°N, 87.7632°W
Timezone	America/Chicago
County	Lake County County
Nearest Airport	Chicago O'Hare International (ORD) 13 miles away

Precipitation & Snow

Annual Rainfall 39.5"

4% above US avg

Snowfall 33.6"

Wettest Month (Aug) 4.06"

Driest Month (Feb) 1.46"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively High
Risk Score	96.0 / 100
Social Vulnerability	14.1 / 100
Community Resilience	78.1 / 100

Hazard Breakdown

Tornado	Very High
Hurricane	Very Low
Earthquake	Relatively Low
Wildfire	Very Low
Flood	Relatively High
Hail	Relatively Moderate
Strong Wind	Very High
Heat Wave	Relatively Moderate
Winter Weather	Relatively Moderate
Lightning	Relatively High
Ice Storm	Relatively Moderate
Drought	Relatively Low
Cold Wave	Very High
Landslide	Very Low
Coastal Flood	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	120 km	10 km
Feb 10, 2010	2 km NW of Lily Lake, Illinois	M3.8	63 km	10 km
Sep 2, 1999	8 km W of Amboy, Illinois	M3.5	146 km	5 km
Nov 4, 2013	1 km SSW of Lyons, Illinois	M3.2	38 km	1 km
Jul 15, 2024	2 km WNW of Somonauk, Illinois	M3.1	96 km	10 km
Mar 25, 2015	3 km WNW of Lake in the Hills, Illinois	M2.9	50 km	6 km
Jun 10, 2013	4 km NNE of Virgil, Illinois	M2.6	64 km	5 km
Mar 15, 2025	6 km W of Dwight, Illinois	M2.6	132 km	5 km

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

Tornado History

477 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 103 fatalities, 2,117 injuries.

Date	Rating	Distance	Path	Fatalities
Aug 28, 1990	EF5	70 km	16.4 mi	29
Jun 29, 1979	EF4	79 km	5.4 mi	0
Jun 13, 1976	EF4	55 km	3.3 mi	2
Sep 28, 1972	EF4	18 km	5.2 mi	0
Apr 21, 1967	EF4	96 km	25.5 mi	24
Apr 21, 1967	EF4	42 km	8.8 mi	1
Apr 21, 1967	EF4	52 km	15.0 mi	33
Apr 11, 1965	EF4	52 km	9.1 mi	6
Jun 20, 2021	EF3	56 km	17.6 mi	0
Jan 7, 2008	EF3	66 km	10.8 mi	0
Jan 7, 2008	EF3	92 km	13.2 mi	0
Mar 27, 1991	EF3	68 km	15.0 mi	0
Apr 27, 1984	EF3	80 km	9.0 mi	1
Mar 12, 1976	EF3	74 km	22.6 mi	0
Mar 12, 1976	EF3	82 km	12.6 mi	0
Jun 20, 1974	EF3	99 km	4.5 mi	0
Oct 24, 1967	EF3	79 km	0.1 mi	0
Nov 12, 1965	EF3	69 km	4.1 mi	0
Apr 11, 1965	EF3	99 km	33.1 mi	0
Jul 19, 1963	EF3	64 km	10.6 mi	0

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

Tsunami History

1 tsunami recorded within 500 km. Highest wave on record: 3.0 m (10 ft).

Year	Location	Cause	Max Wave	Deaths	Distance
1954	MICHIGAN CITY, IN (LAKE MICHIGAN)	Avalanche	3.0 m	7	87 km

Source: NOAA/NCEI Historical Tsunami Database.

Wildfire History

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

Year	Name	Acres Burned	Distance
2019	UNNAMED	1,741	91 km
2019	UNNAMED	1,664	90 km
2021	NORTHEAST PRAIRIE UNIT 3	978	88 km
2024	NORTHEAST PRAIRIE 3 RX	938	87 km
1986	OGDEN DUNS	863	74 km
2021	UNNAMED	738	87 km
2021	MIDDLE GRANT CREEK	700	91 km
2019	UNNAMED	698	86 km
2024	IBSP SOUTH F1 RX	690	31 km
2021	21-INDU TOLLESTON DUNES EAST	594	74 km
2017	UNNAMED	549	91 km
2017	17 INDU COWLES DUNES	522	77 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	24°F (-4°C)	1.8 in	Coldest
February	27°F (-3°C)	1.5 in	Driest
March	37°F (3°C)	2.5 in
April	47°F (9°C)	3.7 in
May	58°F (14°C)	3.5 in
June	68°F (20°C)	3.7 in
July	73°F (23°C)	3.6 in	Warmest
August	72°F (22°C)	4.1 in	Wettest
September	64°F (18°C)	3.5 in
October	53°F (12°C)	2.6 in
November	40°F (5°C)	2.9 in
December	28°F (-2°C)	2.4 in

Glencoe has a seasonal temperature swing of 49°F / from 24°F in January to 73°F in July. Total annual precipitation is 35.7 inches, with August being the wettest month (4.1") and February the driest (1.5").

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