Weather & Climate in Dover, IL

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

Dover 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 39.8 inches. The area receives 28.5 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 746 feet.

Temperature

22°F Jan (-6°C) 74°F Jul (23°C)

Annual Average	49.7°F
	8% below US avg
January Average	22°F (-6°C)
July Average	74°F (23°C)
Sunny Days	275 days/yr

Geography

Elevation	746 ft (227 m)
Area	0.1 sq mi (0.3 km²)
Population Density	452/sq mi
Coordinates	41.4342°N, 89.3958°W
Timezone	America/Chicago
County	Bureau County County
Nearest Airport	Illinois Valley Regional-Walter A Duncan Field (VYS) 14 miles away

Precipitation & Snow

Annual Rainfall 39.8"

5% above US avg

Snowfall 28.5"

Wettest Month (Jun) 4.25"

Driest Month (Feb) 1.22"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	62.3 / 100
Social Vulnerability	41.7 / 100
Community Resilience	80.1 / 100

Hazard Breakdown

Tornado	Relatively Moderate
Hurricane	Very Low
Earthquake	Relatively Low
Wildfire	Very Low
Flood	Relatively Low
Hail	Relatively Moderate
Strong Wind	Relatively Moderate
Heat Wave	Relatively Low
Winter Weather	Relatively Low
Lightning	Relatively Low
Ice Storm	Relatively Moderate
Drought	Relatively High
Cold Wave	Relatively Moderate
Landslide	Relatively 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	41 km	10 km
Feb 10, 2010	2 km NW of Lily Lake, Illinois	M3.8	95 km	10 km
Sep 2, 1999	8 km W of Amboy, Illinois	M3.5	32 km	5 km
Nov 4, 2013	1 km SSW of Lyons, Illinois	M3.2	137 km	1 km
Jul 15, 2024	2 km WNW of Somonauk, Illinois	M3.1	62 km	10 km
Mar 25, 2015	3 km WNW of Lake in the Hills, Illinois	M2.9	120 km	6 km
Jun 10, 2013	4 km NNE of Virgil, Illinois	M2.6	96 km	5 km
Mar 15, 2025	6 km W of Dwight, Illinois	M2.6	84 km	5 km

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

Tornado History

646 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 76 fatalities, 1,299 injuries.

Date	Rating	Distance	Path	Fatalities
Aug 28, 1990	EF5	91 km	16.4 mi	29
Apr 9, 2015	EF4	47 km	30.1 mi	2
Nov 17, 2013	EF4	92 km	46.4 mi	3
Jul 13, 2004	EF4	71 km	9.6 mi	0
Mar 29, 1981	EF4	54 km	5.1 mi	0
Jun 29, 1979	EF4	98 km	5.4 mi	0
Jun 29, 1976	EF4	77 km	4.9 mi	0
Apr 21, 1967	EF4	96 km	25.5 mi	24
Feb 28, 2017	EF3	39 km	11.5 mi	2
Feb 28, 2017	EF3	58 km	17.8 mi	0
Jun 22, 2015	EF3	86 km	16.3 mi	0
Jun 5, 2010	EF3	67 km	8.6 mi	0
Apr 20, 2004	EF3	23 km	15.8 mi	8
May 9, 1995	EF3	37 km	22.0 mi	0
Mar 13, 1990	EF3	76 km	15.5 mi	0
Apr 27, 1984	EF3	90 km	9.0 mi	1
Aug 5, 1979	EF3	67 km	5.7 mi	0
Jun 30, 1977	EF3	37 km	6.1 mi	0
Mar 12, 1976	EF3	90 km	22.6 mi	0
Mar 4, 1976	EF3	30 km	0.8 mi	0

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)	1.2 in	Driest
March	37°F (3°C)	2.6 in
April	49°F (10°C)	3.7 in
May	61°F (16°C)	4.0 in
June	70°F (21°C)	4.3 in	Wettest
July	74°F (23°C)	3.8 in	Warmest
August	72°F (22°C)	4.1 in
September	64°F (18°C)	3.8 in
October	52°F (11°C)	2.7 in
November	39°F (4°C)	2.5 in
December	26°F (-3°C)	2.1 in

Dover has a seasonal temperature swing of 52°F / from 22°F in January to 74°F in July. Total annual precipitation is 36.1 inches, with June being the wettest month (4.3") and February the driest (1.2").

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