Weather & Climate in Spring Bay, IL

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

Spring Bay experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 26°F in January while summers reach 76°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 37.6 inches. The area receives 26.2 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 456 feet.

Temperature

26°F Jan (-4°C) 76°F Jul (25°C)

Annual Average	52.7°F
	2% below US avg
January Average	26°F (-4°C)
July Average	76°F (25°C)
Sunny Days	275 days/yr

Geography

Elevation	456 ft (139 m)
Area	0.7 sq mi (1.8 km²)
Population Density	752/sq mi
Coordinates	40.8212°N, 89.5311°W
Timezone	America/Chicago
County	Peoria County County
Nearest Airport	General Downing - Peoria International (PIA) 14 miles away

Precipitation & Snow

Annual Rainfall 37.6"

1% below US avg

Snowfall 26.2"

Wettest Month (May) 4.06"

Driest Month (Feb) 1.50"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Moderate
Risk Score	90.7 / 100
Social Vulnerability	50.0 / 100
Community Resilience	93.6 / 100

Hazard Breakdown

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

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

Earthquake History

4 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	89 km	10 km
Sep 2, 1999	8 km W of Amboy, Illinois	M3.5	100 km	5 km
Jul 15, 2024	2 km WNW of Somonauk, Illinois	M3.1	115 km	10 km
Mar 15, 2025	6 km W of Dwight, Illinois	M2.6	91 km	5 km

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

Tornado History

679 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 25 fatalities, 614 injuries.

Date	Rating	Distance	Path	Fatalities
Nov 17, 2013	EF4	22 km	46.4 mi	3
Jul 13, 2004	EF4	17 km	9.6 mi	0
May 13, 1995	EF4	82 km	7.0 mi	0
May 5, 1977	EF4	68 km	7.3 mi	0
Jun 29, 1976	EF4	19 km	4.9 mi	0
Apr 4, 2023	EF3	86 km	19.9 mi	0
Feb 28, 2017	EF3	18 km	17.8 mi	0
Feb 28, 2017	EF3	74 km	11.5 mi	2
Dec 31, 2010	EF3	97 km	3.6 mi	0
Jun 5, 2010	EF3	74 km	8.6 mi	0
Aug 19, 2009	EF3	96 km	24.3 mi	0
Apr 20, 2004	EF3	52 km	15.8 mi	8
May 10, 2003	EF3	41 km	17.5 mi	0
Apr 19, 1996	EF3	58 km	9.4 mi	0
May 13, 1995	EF3	56 km	25.0 mi	0
May 9, 1995	EF3	58 km	22.0 mi	0
Jun 30, 1977	EF3	95 km	6.1 mi	0
Mar 4, 1976	EF3	42 km	0.8 mi	0
Jul 23, 1975	EF3	61 km	14.0 mi	2
Jul 23, 1975	EF3	74 km	11.1 mi	0

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	26°F (-4°C)	1.5 in	Coldest
February	28°F (-2°C)	1.5 in	Driest
March	39°F (4°C)	2.9 in
April	51°F (11°C)	3.7 in
May	62°F (17°C)	4.1 in	Wettest
June	71°F (22°C)	4.0 in
July	76°F (25°C)	3.9 in	Warmest
August	73°F (23°C)	3.4 in
September	66°F (19°C)	3.7 in
October	54°F (12°C)	2.8 in
November	41°F (5°C)	2.8 in
December	28°F (-2°C)	2.4 in

Spring Bay has a seasonal temperature swing of 51°F / from 26°F in January to 76°F in July. Total annual precipitation is 36.9 inches, with May being the wettest month (4.1") and February the driest (1.5").

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