Weather & Climate in Prairie du Rocher, IL

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

Prairie du Rocher enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 32°F in January while summers reach 78°F in July. The area gets 293 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 43.6 inches. The area receives 9.2 inches of snow annually. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 389 feet.

Temperature

32°F Jan (-0°C) 78°F Jul (25°C)

Annual Average	55.7°F
	3% above US avg
January Average	32°F (-0°C)
July Average	78°F (25°C)
Sunny Days	293 days/yr

Geography

Elevation	389 ft (119 m)
Area	0.2 sq mi (0.6 km²)
Population Density	758/sq mi
Coordinates	38.0817°N, 90.0976°W
Timezone	America/Chicago
County	Monroe County County
Nearest Airport	Farmington Regional (FAM) 26 miles away

Precipitation & Snow

Annual Rainfall 43.6"

15% above US avg

Snowfall 9.2"

Wettest Month (May) 4.17"

Driest Month (Jan) 2.09"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Very Low
Risk Score	41.9 / 100
Social Vulnerability	10.6 / 100
Community Resilience	94.9 / 100

Hazard Breakdown

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

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

Earthquake History

75 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.8.

Sep 26, 1990	4 km SE of Chaffee, Missouri	M4.8	112 km	1 km
Feb 5, 1994	2 km WNW of Dongola, Illinois	M4.2	113 km	16 km
Jun 7, 2011	18 km NNW of Potosi, Missouri	M3.9	70 km	21 km
Feb 21, 2012	4 km SSE of Bertrand, Missouri	M3.9	147 km	8 km
Jan 2, 2006	3 km NNE of Eldorado, Illinois	M3.6	150 km	7 km
May 1, 2016	5 km SE of New Grand Chain, Illinois	M3.5	137 km	16 km
Mar 2, 1990	9 km NW of Vernon, Illinois	M3.4	118 km	0 km
Aug 27, 1993	5 km SSE of Olympian Village, Missouri	M3.3	30 km	22 km
Oct 24, 1990	5 km ENE of Woodlawn, Illinois	M3.2	103 km	1 km
Jan 29, 1993	7 km WNW of Brownstown, Illinois	M3.2	141 km	5 km
Dec 27, 1992	2 km E of Pocahontas, Missouri	M3.2	77 km	10 km
Apr 6, 1994	2 km NE of Tamaroa, Illinois	M3.2	78 km	15 km
May 2, 2003	10 km ENE of Thompsonville, Illinois	M3.2	126 km	0 km
Jul 1, 2017	9 km SSE of Mulberry Grove, Illinois	M3.1	114 km	17 km
Jan 23, 1991	3 km WSW of Logan, Illinois	M3.1	108 km	1 km
Mar 12, 2002	6 km S of Marble Hill, Missouri	M3.1	93 km	10 km
Feb 28, 1994	5 km NW of Harrison, Illinois	M3.0	69 km	5 km
Jun 27, 2005	6 km E of Grand Tower, Illinois	M3.0	78 km	10 km
Mar 1, 2006	2 km N of Buncombe, Illinois	M3.0	118 km	6 km
May 18, 2006	9 km SSE of De Soto, Missouri	M2.9	38 km	6 km

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

Tornado History

615 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 105 fatalities, 1,644 injuries.

Date	Rating	Distance	Path	Fatalities
Dec 18, 1957	EF5	74 km	5.4 mi	1
Feb 28, 2017	EF4	41 km	53.5 mi	1
Nov 17, 2013	EF4	68 km	10.6 mi	2
Apr 22, 2011	EF4	80 km	21.3 mi	0
Sep 22, 2006	EF4	51 km	27.5 mi	0
May 29, 1982	EF4	90 km	17.0 mi	10
Apr 3, 1981	EF4	71 km	11.9 mi	0
Jun 22, 1969	EF4	56 km	15.1 mi	4
Jun 22, 1969	EF4	89 km	20.2 mi	2
Jan 24, 1967	EF4	77 km	25.0 mi	3
Feb 10, 1959	EF4	66 km	23.9 mi	21
Dec 18, 1957	EF4	69 km	28.3 mi	11
Dec 18, 1957	EF4	92 km	16.8 mi	1
Feb 24, 1956	EF4	83 km	77.6 mi	6
Dec 10, 2021	EF3	91 km	24.8 mi	1
Dec 10, 2021	EF3	75 km	4.2 mi	6
Oct 24, 2021	EF3	50 km	16.7 mi	0
Oct 24, 2021	EF3	65 km	18.8 mi	0
May 31, 2013	EF3	88 km	31.7 mi	0
May 31, 2013	EF3	80 km	10.6 mi	0

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

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: SMITH MILL HOLLOW (3,978 acres, 2022).

Year	Name	Acres Burned	Distance
2022	SMITH MILL HOLLOW	3,978	81 km
2021	COUNCIL BLUFF	3,035	84 km
2024	COUNCIL BLUFF WEST RX	2,846	84 km
2005	UNNAMED	2,751	83 km
2019	UNNAMED	2,688	85 km
2010	COUNCIL BLUFF LAKE	2,651	84 km
2006	UNNAMED	2,512	85 km
2021	RED SHALE UNIT RX	2,123	100 km
2021	BEAR PAW	2,080	87 km
2024	BEAR PAW RX	2,067	87 km
2004	CICERO CREEK	1,846	80 km
2021	BERRYMAN BLOCK B AND C	1,728	86 km
2015	CARTY	1,674	99 km
2015	UNNAMED	1,586	83 km
2010	DELBRIDGE SOUTH	1,574	83 km
2000	UNNAMED	1,552	67 km
1999	UNNAMED	1,483	67 km
2024	HARMON SPRING RX	1,330	85 km
2018	UNNAMED	1,285	85 km
2000	UNNAMED	1,260	82 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	32°F (-0°C)	2.1 in	Coldest, Driest
February	35°F (2°C)	2.4 in
March	45°F (7°C)	3.9 in
April	56°F (13°C)	3.7 in
May	65°F (18°C)	4.2 in	Wettest
June	74°F (23°C)	3.5 in
July	78°F (25°C)	3.9 in	Warmest
August	76°F (25°C)	3.5 in
September	69°F (21°C)	3.5 in
October	58°F (14°C)	3.0 in
November	46°F (8°C)	3.8 in
December	35°F (2°C)	3.4 in

Prairie du Rocher has a seasonal temperature swing of 46°F / from 32°F in January to 78°F in July. Total annual precipitation is 40.8 inches, with May being the wettest month (4.2") and January the driest (2.1").

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