Weather & Climate in Marissa, IL

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

Marissa 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 421 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	421 ft (128 m)
Area	7.2 sq mi (18.7 km²)
Population Density	157/sq mi
Coordinates	38.2497°N, 89.7714°W
Timezone	America/Chicago
County	Randolph County County
Nearest Airport	Farmington Regional (FAM) 46 miles away

Precipitation & Snow

Annual Rainfall 45.6"

20% above US avg

Snowfall 10.6"

Wettest Month (May) 4.25"

Driest Month (Jan) 2.17"

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

63 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	123 km	1 km
Feb 5, 1994	2 km WNW of Dongola, Illinois	M4.2	111 km	16 km
Jun 7, 2011	18 km NNW of Potosi, Missouri	M3.9	101 km	21 km
Jan 2, 2006	3 km NNE of Eldorado, Illinois	M3.6	127 km	7 km
May 1, 2016	5 km SE of New Grand Chain, Illinois	M3.5	134 km	16 km
Mar 2, 1990	9 km NW of Vernon, Illinois	M3.4	85 km	0 km
May 30, 2015	4 km ENE of Geff, Illinois	M3.4	126 km	26 km
Aug 27, 1993	5 km SSE of Olympian Village, Missouri	M3.3	61 km	22 km
May 2, 2003	10 km ENE of Thompsonville, Illinois	M3.2	102 km	0 km
Apr 6, 1994	2 km NE of Tamaroa, Illinois	M3.2	50 km	15 km
Jan 29, 1993	7 km WNW of Brownstown, Illinois	M3.2	108 km	5 km
Oct 24, 1990	5 km ENE of Woodlawn, Illinois	M3.2	71 km	1 km
Dec 27, 1992	2 km E of Pocahontas, Missouri	M3.2	84 km	10 km
Jul 1, 2017	9 km SSE of Mulberry Grove, Illinois	M3.1	82 km	17 km
Jan 23, 1991	3 km WSW of Logan, Illinois	M3.1	86 km	1 km
Mar 12, 2002	6 km S of Marble Hill, Missouri	M3.1	112 km	10 km
Jun 27, 2005	6 km E of Grand Tower, Illinois	M3.0	75 km	10 km
Feb 28, 1994	5 km NW of Harrison, Illinois	M3.0	58 km	5 km
Mar 1, 2006	2 km N of Buncombe, Illinois	M3.0	109 km	6 km
Sep 5, 2004	3 km WNW of Saint Peter, Illinois	M2.9	104 km	33 km

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

Tornado History

647 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 85 fatalities, 1,568 injuries.

Date	Rating	Distance	Path	Fatalities
Dec 18, 1957	EF5	49 km	5.4 mi	1
Feb 28, 2017	EF4	62 km	53.5 mi	1
Nov 17, 2013	EF4	34 km	10.6 mi	2
Apr 22, 2011	EF4	83 km	21.3 mi	0
Sep 22, 2006	EF4	64 km	27.5 mi	0
May 29, 1982	EF4	75 km	17.0 mi	10
Apr 3, 1981	EF4	61 km	11.9 mi	0
Jun 22, 1969	EF4	89 km	15.1 mi	4
Jan 24, 1967	EF4	83 km	25.0 mi	3
Feb 10, 1959	EF4	79 km	23.9 mi	21
Dec 18, 1957	EF4	66 km	28.3 mi	11
Dec 18, 1957	EF4	61 km	16.8 mi	1
May 26, 2024	EF3	100 km	4.9 mi	0
Dec 10, 2021	EF3	62 km	4.2 mi	6
Oct 24, 2021	EF3	96 km	18.8 mi	0
Oct 24, 2021	EF3	82 km	16.7 mi	0
May 31, 2013	EF3	70 km	10.6 mi	0
May 31, 2013	EF3	98 km	31.7 mi	0
Dec 31, 2010	EF3	67 km	6.7 mi	1
Mar 11, 2006	EF3	51 km	5.1 mi	0

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

Wildfire History

15 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	88 km
2024	RED SHALE RX	1,259	88 km
2019	KINKAID RX	1,215	57 km
2022	KINKAID STATE FISH AND WILDLIFE AREA RX	1,115	57 km
2021	STATE OF ILLINOIS TRACT RX	1,011	48 km
2021	MILL CREEK RX	898	84 km
2024	HAMPTON NORTH RX	807	86 km
2005	UNNAMED	741	82 km
2018	UNNAMED	729	55 km
1995	UNNAMED	724	82 km
2024	HERRIN FLATS RX	713	90 km
2020	UNNAMED	687	55 km
2024	HAMPTON RX	628	88 km
2022	BLOWDOWN 16 RX	553	59 km
2019	PINE HILLS RX	542	85 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	31°F (-1°C)	2.2 in	Coldest, Driest
February	35°F (1°C)	2.5 in
March	45°F (7°C)	3.8 in
April	55°F (13°C)	3.9 in
May	65°F (18°C)	4.3 in	Wettest
June	74°F (23°C)	3.7 in
July	77°F (25°C)	3.9 in	Warmest
August	76°F (25°C)	3.2 in
September	69°F (21°C)	3.3 in
October	58°F (14°C)	3.0 in
November	46°F (8°C)	3.6 in
December	35°F (2°C)	3.1 in

Marissa has a seasonal temperature swing of 46°F / from 31°F in January to 77°F in July. Total annual precipitation is 40.4 inches, with May being the wettest month (4.3") and January the driest (2.2").

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