Weather & Climate in Hanover, IL

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

Hanover experiences four distinct seasons with an average annual temperature of 48°F (9°C). Winters average 19°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 39.4 inches. The area receives 30.2 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 639 feet.

Temperature

19°F Jan (-7°C) 72°F Jul (22°C)

Annual Average	47.5°F
	12% below US avg
January Average	19°F (-7°C)
July Average	72°F (22°C)
Sunny Days	260 days/yr

Geography

Elevation	639 ft (195 m)
Area	0.4 sq mi (1.1 km²)
Population Density	756/sq mi
Coordinates	42.2552°N, 90.2736°W
Timezone	America/Chicago
County	Jo Daviess County County
Nearest Airport	Dubuque Regional (DBQ) 24 miles away

Precipitation & Snow

Annual Rainfall 39.4"

4% above US avg

Snowfall 30.2"

Wettest Month (Jun) 4.37"

Driest Month (Jan) 1.18"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	51.3 / 100
Social Vulnerability	48.8 / 100
Community Resilience	59.5 / 100

Hazard Breakdown

Tornado	Relatively Moderate
Hurricane	Very Low
Earthquake	Very Low
Wildfire	Very Low
Flood	Relatively Low
Hail	Relatively Moderate
Strong Wind	Relatively Moderate
Heat Wave	Relatively Low
Winter Weather	Relatively Low
Lightning	Very Low
Ice Storm	Relatively Low
Drought	Relatively Moderate
Cold Wave	Relatively Moderate
Landslide	Relatively Moderate

Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

5 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	144 km	10 km
Feb 10, 2010	2 km NW of Lily Lake, Illinois	M3.8	150 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	146 km	10 km
Jun 10, 2013	4 km NNE of Virgil, Illinois	M2.6	149 km	5 km

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

Tornado History

568 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 17 fatalities, 463 injuries.

Date	Rating	Distance	Path	Fatalities
Jun 7, 1984	EF5	83 km	36.0 mi	9
Apr 9, 2015	EF4	93 km	30.1 mi	2
Mar 13, 1990	EF4	94 km	19.0 mi	0
Jul 3, 1983	EF4	80 km	0.5 mi	0
Mar 29, 1981	EF4	69 km	5.1 mi	0
Aug 12, 1974	EF4	100 km	5.0 mi	0
Apr 11, 1965	EF4	71 km	91.5 mi	1
May 9, 1995	EF3	90 km	10.0 mi	0
Jun 19, 1993	EF3	37 km	14.0 mi	0
Jul 13, 1992	EF3	71 km	5.0 mi	0
Jun 17, 1992	EF3	92 km	16.0 mi	0
Mar 13, 1990	EF3	73 km	15.5 mi	0
May 8, 1988	EF3	70 km	32.0 mi	0
May 8, 1988	EF3	36 km	16.0 mi	0
Aug 5, 1979	EF3	63 km	5.7 mi	0
Jun 20, 1974	EF3	31 km	10.6 mi	1
May 13, 1974	EF3	76 km	3.6 mi	0
Sep 9, 1970	EF3	42 km	4.7 mi	0
Apr 16, 1967	EF3	41 km	27.8 mi	0
Jan 24, 1967	EF3	30 km	7.4 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	19°F (-7°C)	1.2 in	Coldest, Driest
February	24°F (-5°C)	1.2 in
March	36°F (2°C)	2.4 in
April	48°F (9°C)	3.4 in
May	60°F (15°C)	3.7 in
June	69°F (20°C)	4.4 in	Wettest
July	72°F (22°C)	3.6 in	Warmest
August	71°F (22°C)	4.3 in
September	63°F (17°C)	3.9 in
October	51°F (11°C)	2.6 in
November	37°F (3°C)	2.5 in
December	24°F (-5°C)	1.8 in

Hanover has a seasonal temperature swing of 53°F / from 19°F in January to 72°F in July. Total annual precipitation is 35.0 inches, with June being the wettest month (4.4") and January the driest (1.2").

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