Weather & Climate in Percy, IL

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

Percy experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 31°F in January while summers reach 77°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 45.6 inches. The area receives 10.6 inches of snow annually. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 474 feet.

Temperature

31°F Jan (-1°C) 77°F Jul (25°C)

Annual Average	55.1°F
	2% above US avg
January Average	31°F (-1°C)
July Average	77°F (25°C)
Sunny Days	293 days/yr

Geography

Elevation	474 ft (144 m)
Area	1.0 sq mi (2.5 km²)
Population Density	1,035/sq mi
Coordinates	38.0147°N, 89.6181°W
Timezone	America/Chicago
County	Randolph County County
Nearest Airport	Farmington Regional (FAM) 45 miles away

Precipitation & Snow

Annual Rainfall 45.6"

20% above US avg

Snowfall 10.6"

Wettest Month (May) 4.41"

Driest Month (Jan) 2.28"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	78.6 / 100
Social Vulnerability	55.8 / 100
Community Resilience	80.2 / 100

Hazard Breakdown

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

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

Earthquake History

127 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	96 km	1 km
Feb 5, 1994	2 km WNW of Dongola, Illinois	M4.2	81 km	16 km
Jun 6, 2003	1 km NE of Bardwell, Kentucky	M4.0	138 km	3 km
Jun 7, 2011	18 km NNW of Potosi, Missouri	M3.9	113 km	21 km
Feb 21, 2012	4 km SSE of Bertrand, Missouri	M3.9	128 km	8 km
Mar 2, 2010	2 km ENE of East Prairie, Missouri	M3.7	138 km	8 km
Jun 20, 2005	4 km WSW of Blandville, Kentucky	M3.6	133 km	19 km
Jan 2, 2006	3 km NNE of Eldorado, Illinois	M3.6	107 km	7 km
Mar 15, 2017	9 km ESE of Wyatt, Missouri	M3.6	133 km	8 km
Jul 16, 2004	6 km SE of Wyatt, Missouri	M3.5	134 km	4 km
May 1, 2016	5 km SE of New Grand Chain, Illinois	M3.5	105 km	16 km
Jun 15, 2004	3 km S of Canalou, Missouri	M3.5	143 km	5 km
Mar 2, 1990	9 km NW of Vernon, Illinois	M3.4	101 km	0 km
May 30, 2015	4 km ENE of Geff, Illinois	M3.4	121 km	26 km
Sep 26, 1994	4 km ENE of Blandville, Kentucky	M3.4	133 km	13 km
Aug 27, 1993	5 km SSE of Olympian Village, Missouri	M3.3	72 km	22 km
May 16, 2017	9 km ESE of Wyatt, Missouri	M3.3	134 km	9 km
Jan 29, 1993	7 km WNW of Brownstown, Illinois	M3.2	124 km	5 km
Apr 8, 1998	2 km NNW of Blandville, Kentucky	M3.2	130 km	13 km
Apr 6, 1994	2 km NE of Tamaroa, Illinois	M3.2	39 km	15 km

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

Tornado History

604 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 78 fatalities, 1,089 injuries.

Date	Rating	Distance	Path	Fatalities
Dec 18, 1957	EF5	33 km	5.4 mi	1
Feb 28, 2017	EF4	47 km	53.5 mi	1
Nov 17, 2013	EF4	47 km	10.6 mi	2
Feb 29, 2012	EF4	92 km	26.1 mi	8
Sep 22, 2006	EF4	42 km	27.5 mi	0
May 6, 2003	EF4	98 km	33.0 mi	2
May 29, 1982	EF4	49 km	17.0 mi	10
Apr 3, 1981	EF4	90 km	11.9 mi	0
Jun 22, 1969	EF4	88 km	15.1 mi	4
Dec 18, 1957	EF4	56 km	16.8 mi	1
Dec 18, 1957	EF4	37 km	28.3 mi	11
May 26, 2024	EF3	72 km	4.9 mi	0
Dec 10, 2021	EF3	91 km	4.2 mi	6
Oct 24, 2021	EF3	78 km	16.7 mi	0
Oct 24, 2021	EF3	86 km	18.8 mi	0
May 31, 2013	EF3	99 km	10.6 mi	0
Dec 31, 2010	EF3	91 km	6.7 mi	1
Mar 11, 2006	EF3	63 km	5.1 mi	0
Mar 11, 2006	EF3	40 km	53.5 mi	2
May 6, 2003	EF3	71 km	2.0 mi	0

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

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: RED SHALE UNIT RX (2,123 acres, 2021).

Year	Name	Acres Burned	Distance
2021	RED SHALE UNIT RX	2,123	60 km
2014	UNNAMED	1,627	72 km
2019	ATWOOD RIDGE RX	1,622	72 km
2000	UNNAMED	1,552	98 km
1999	UNNAMED	1,483	98 km
2020	UNNAMED	1,334	92 km
2024	RED SHALE RX	1,259	61 km
2017	UNNAMED	1,257	80 km
2021	OZARK HILL PRAIRIE RX	1,235	80 km
2019	KINKAID RX	1,215	28 km
2022	KINKAID STATE FISH AND WILDLIFE AREA RX	1,115	27 km
2021	STATE OF ILLINOIS TRACT RX	1,011	18 km
2022	BEAN RIDGE RX	955	87 km
2021	MILL CREEK RX	898	55 km
2024	HAMPTON NORTH RX	807	59 km
2005	UNNAMED	741	82 km
2018	UNNAMED	729	26 km
1995	UNNAMED	724	82 km
2024	HERRIN FLATS RX	713	62 km
2024	WOLF CREEK (OLIVE BR) RX	691	93 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	31°F (-1°C)	2.3 in	Coldest, Driest
February	35°F (2°C)	2.6 in
March	45°F (7°C)	4.1 in
April	56°F (13°C)	4.0 in
May	65°F (18°C)	4.4 in	Wettest
June	74°F (23°C)	3.9 in
July	77°F (25°C)	3.9 in	Warmest
August	76°F (25°C)	3.3 in
September	69°F (21°C)	3.2 in
October	58°F (14°C)	3.1 in
November	46°F (8°C)	3.9 in
December	35°F (2°C)	3.4 in

Percy has a seasonal temperature swing of 46°F / from 31°F in January to 77°F in July. Total annual precipitation is 42.1 inches, with May being the wettest month (4.4") and January the driest (2.3").

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