Weather & Climate in Oregon, IL

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

Oregon experiences four distinct seasons with an average annual temperature of 49°F (10°C). Winters average 22°F in January while summers reach 74°F in July. The area gets 260 sunny days per year, above the national average. Annual precipitation totals 37.2 inches. The area receives 37.1 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 708 feet.

Temperature

22°F Jan (-6°C) 74°F Jul (23°C)

Annual Average	49.4°F
	9% below US avg
January Average	22°F (-6°C)
July Average	74°F (23°C)
Sunny Days	260 days/yr

Geography

Elevation	708 ft (216 m)
Area	2.0 sq mi (5.3 km²)
Population Density	1,980/sq mi
Coordinates	42.0127°N, 89.3358°W
Timezone	America/Chicago
County	Ogle County County
Nearest Airport	Chicago/Rockford International (RFD) 18 miles away

Precipitation & Snow

Annual Rainfall 37.2"

2% below US avg

Snowfall 37.1"

Wettest Month (Jun) 4.49"

Driest Month (Feb) 1.22"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	71.1 / 100
Social Vulnerability	17.5 / 100
Community Resilience	86.1 / 100

Hazard Breakdown

Tornado	Relatively Moderate
Hurricane	Very Low
Earthquake	Relatively Low
Wildfire	Very Low
Flood	Relatively Moderate
Hail	Relatively Moderate
Strong Wind	Relatively Moderate
Heat Wave	Relatively Low
Winter Weather	Very Low
Lightning	Relatively Low
Ice Storm	Relatively Low
Drought	Relatively Moderate
Cold Wave	Relatively Moderate
Landslide	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	71 km	10 km
Feb 10, 2010	2 km NW of Lily Lake, Illinois	M3.8	69 km	10 km
Sep 2, 1999	8 km W of Amboy, Illinois	M3.5	33 km	5 km
Nov 4, 2013	1 km SSW of Lyons, Illinois	M3.2	127 km	1 km
Jul 15, 2024	2 km WNW of Somonauk, Illinois	M3.1	66 km	10 km
Mar 25, 2015	3 km WNW of Lake in the Hills, Illinois	M2.9	82 km	6 km
Jun 10, 2013	4 km NNE of Virgil, Illinois	M2.6	68 km	5 km
Mar 15, 2025	6 km W of Dwight, Illinois	M2.6	124 km	5 km

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

Tornado History

586 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 81 fatalities, 1,357 injuries.

Date	Rating	Distance	Path	Fatalities
Aug 28, 1990	EF5	90 km	16.4 mi	29
Apr 9, 2015	EF4	18 km	30.1 mi	2
Mar 29, 1981	EF4	63 km	5.1 mi	0
Apr 21, 1967	EF4	41 km	25.5 mi	24
Apr 21, 1967	EF4	89 km	8.8 mi	1
Apr 11, 1965	EF4	82 km	9.1 mi	6
Jun 20, 2021	EF3	99 km	17.6 mi	0
Feb 28, 2017	EF3	83 km	11.5 mi	2
Jan 7, 2008	EF3	59 km	13.2 mi	0
Apr 20, 2004	EF3	85 km	15.8 mi	8
May 9, 1995	EF3	88 km	22.0 mi	0
Jun 17, 1992	EF3	98 km	16.0 mi	0
Mar 13, 1990	EF3	91 km	15.5 mi	0
May 8, 1988	EF3	97 km	16.0 mi	0
Apr 27, 1984	EF3	98 km	9.0 mi	1
Aug 5, 1979	EF3	20 km	5.7 mi	0
Jun 30, 1977	EF3	56 km	6.1 mi	0
Mar 12, 1976	EF3	92 km	22.6 mi	0
Mar 4, 1976	EF3	92 km	0.8 mi	0
Jun 20, 1974	EF3	77 km	10.6 mi	1

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	77 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	22°F (-6°C)	1.4 in	Coldest
February	23°F (-5°C)	1.2 in	Driest
March	35°F (2°C)	2.4 in
April	47°F (9°C)	3.5 in
May	59°F (15°C)	4.0 in
June	68°F (20°C)	4.5 in	Wettest
July	74°F (23°C)	3.7 in	Warmest
August	70°F (21°C)	4.2 in
September	62°F (17°C)	3.8 in
October	51°F (10°C)	2.7 in
November	37°F (3°C)	2.6 in
December	24°F (-4°C)	2.0 in

Oregon 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 (4.5") and February the driest (1.2").

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