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Weather & Climate in Savanna, IL

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

Savanna 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 708 feet.

Temperature

19°F Jan (-7°C) 72°F Jul (22°C)
Annual Average47.5°F
12% below US avg
January Average19°F (-7°C)
July Average72°F (22°C)
Sunny Days260 days/yr

Geography

Elevation708 ft (216 m)
Area2.7 sq mi (7.0 km²)
Population Density1,088/sq mi
Coordinates42.0938°N, 90.1391°W
TimezoneAmerica/Chicago
CountyJo Daviess County County
Nearest AirportDubuque Regional (DBQ)
36 miles away

Precipitation & Snow

Annual Rainfall 39.4"
4% above US avg
Snowfall 30.2"
Wettest Month (Jun) 4.57"
Driest Month (Jan) 1.34"

Air Quality

AQI Median43.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Low
Risk Score51.3 / 100
Social Vulnerability48.8 / 100
Community Resilience59.5 / 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

6 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.2.

Jun 28, 2004 12 km NW of Dayton, Illinois M4.2 125 km 10 km
Feb 10, 2010 2 km NW of Lily Lake, Illinois M3.8 136 km 10 km
Sep 2, 1999 8 km W of Amboy, Illinois M3.5 72 km 5 km
Jul 15, 2024 2 km WNW of Somonauk, Illinois M3.1 128 km 10 km
Mar 25, 2015 3 km WNW of Lake in the Hills, Illinois M2.9 147 km 6 km
Jun 10, 2013 4 km NNE of Virgil, Illinois M2.6 135 km 5 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

603 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 16 fatalities, 430 injuries.

Date Rating Distance Path Fatalities
Jun 7, 1984 EF5 98 km 36.0 mi 9
Apr 9, 2015 EF4 75 km 30.1 mi 2
Jul 3, 1983 EF4 97 km 0.5 mi 0
Mar 29, 1981 EF4 49 km 5.1 mi 0
Apr 11, 1965 EF4 71 km 91.5 mi 1
May 9, 1995 EF3 93 km 22.0 mi 0
May 9, 1995 EF3 83 km 10.0 mi 0
Jun 19, 1993 EF3 54 km 14.0 mi 0
Jul 13, 1992 EF3 82 km 5.0 mi 0
Mar 13, 1990 EF3 56 km 15.5 mi 0
May 8, 1988 EF3 55 km 16.0 mi 0
May 8, 1988 EF3 65 km 32.0 mi 0
Aug 5, 1979 EF3 47 km 5.7 mi 0
Jun 20, 1974 EF3 17 km 10.6 mi 1
Jun 14, 1974 EF3 91 km 48.6 mi 0
May 13, 1974 EF3 65 km 3.6 mi 0
Sep 9, 1970 EF3 63 km 4.7 mi 0
Apr 16, 1967 EF3 50 km 27.8 mi 0
Jan 24, 1967 EF3 85 km 24.9 mi 0
Jan 24, 1967 EF3 10 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 77 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 19°F (-7°C) 1.3 in Coldest, Driest
February 24°F (-5°C) 1.4 in
March 36°F (2°C) 2.6 in
April 48°F (9°C) 3.5 in
May 60°F (15°C) 4.1 in
June 69°F (20°C) 4.6 in Wettest
July 72°F (22°C) 3.7 in Warmest
August 71°F (21°C) 4.4 in
September 63°F (17°C) 3.7 in
October 51°F (11°C) 2.7 in
November 37°F (3°C) 2.6 in
December 24°F (-4°C) 1.9 in

Savanna has a seasonal temperature swing of 53°F / from 19°F in January to 72°F in July. Total annual precipitation is 36.6 inches, with June being the wettest month (4.6") and January the driest (1.3").

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