Weather & Climate in Mount Carroll, IL

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

Mount Carroll experiences four distinct seasons with an average annual temperature of 49°F (9°C). Winters average 21°F in January while summers reach 73°F in July. The area gets 246 sunny days per year, above the national average. Annual precipitation totals 40.3 inches. The area receives 33.4 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 793 feet.

Temperature

21°F Jan (-6°C) 73°F Jul (23°C)

Annual Average	48.5°F
	10% below US avg
January Average	21°F (-6°C)
July Average	73°F (23°C)
Sunny Days	246 days/yr

Geography

Elevation	793 ft (242 m)
Area	2.0 sq mi (5.2 km²)
Population Density	758/sq mi
Coordinates	42.0948°N, 89.9769°W
Timezone	America/Chicago
County	Carroll County County
Nearest Airport	Dubuque Regional (DBQ) 43 miles away

Precipitation & Snow

Annual Rainfall 40.3"

6% above US avg

Snowfall 33.4"

Wettest Month (Jun) 4.61"

Driest Month (Jan) 1.38"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very Low
Risk Score	39.0 / 100
Social Vulnerability	55.4 / 100
Community Resilience	69.4 / 100

Hazard Breakdown

Tornado	Relatively Low
Hurricane	Very Low
Earthquake	Very Low
Wildfire	Very Low
Flood	Relatively Low
Hail	Relatively Moderate
Strong Wind	Relatively Moderate
Heat Wave	Very Low
Winter Weather	Relatively Low
Lightning	Very Low
Ice Storm	Relatively Low
Drought	Relatively Moderate
Cold Wave	Relatively Low
Landslide	Relatively 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	114 km	10 km
Feb 10, 2010	2 km NW of Lily Lake, Illinois	M3.8	123 km	10 km
Sep 2, 1999	8 km W of Amboy, Illinois	M3.5	61 km	5 km
Jul 15, 2024	2 km WNW of Somonauk, Illinois	M3.1	116 km	10 km
Mar 25, 2015	3 km WNW of Lake in the Hills, Illinois	M2.9	133 km	6 km
Jun 10, 2013	4 km NNE of Virgil, Illinois	M2.6	122 km	5 km

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

Tornado History

593 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 41 fatalities, 910 injuries.

Date	Rating	Distance	Path	Fatalities
Jun 7, 1984	EF5	97 km	36.0 mi	9
Apr 9, 2015	EF4	63 km	30.1 mi	2
Jul 3, 1983	EF4	98 km	0.5 mi	0
Mar 29, 1981	EF4	46 km	5.1 mi	0
Apr 21, 1967	EF4	88 km	25.5 mi	24
Apr 11, 1965	EF4	83 km	91.5 mi	1
Jan 7, 2008	EF3	100 km	13.2 mi	0
May 9, 1995	EF3	94 km	10.0 mi	0
May 9, 1995	EF3	90 km	22.0 mi	0
Jun 19, 1993	EF3	66 km	14.0 mi	0
Jul 13, 1992	EF3	96 km	5.0 mi	0
Jun 17, 1992	EF3	95 km	16.0 mi	0
Mar 13, 1990	EF3	61 km	15.5 mi	0
May 8, 1988	EF3	58 km	16.0 mi	0
May 8, 1988	EF3	77 km	32.0 mi	0
Aug 5, 1979	EF3	34 km	5.7 mi	0
Jun 30, 1977	EF3	99 km	6.1 mi	0
Jun 20, 1974	EF3	27 km	10.6 mi	1
Jun 14, 1974	EF3	98 km	48.6 mi	0
May 13, 1974	EF3	74 km	3.6 mi	0

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

Wildfire History

1 wildfire (100+ acres) recorded within 100 km. Largest: COLD SPRINGS (552 acres, 2009).

Year	Name	Acres Burned	Distance
2009	COLD SPRINGS	552	70 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	21°F (-6°C)	1.4 in	Coldest, Driest
February	23°F (-5°C)	1.4 in
March	35°F (2°C)	2.6 in
April	47°F (9°C)	3.6 in
May	59°F (15°C)	4.3 in
June	68°F (20°C)	4.6 in	Wettest
July	73°F (23°C)	3.7 in	Warmest
August	70°F (21°C)	4.4 in
September	62°F (17°C)	3.7 in
October	51°F (10°C)	2.8 in
November	37°F (3°C)	2.8 in
December	24°F (-5°C)	2.0 in

Mount Carroll has a seasonal temperature swing of 52°F / from 21°F in January to 73°F in July. Total annual precipitation is 37.2 inches, with June being the wettest month (4.6") and January the driest (1.4").

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