Weather & Climate in Nason, IL

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

Nason enjoys a temperate climate with an average annual temperature of 56°F (13°C). Winters average 31°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 46.0 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 435 feet.

Temperature

31°F Jan (-1°C) 78°F Jul (26°C)

Annual Average	55.9°F
	4% above US avg
January Average	31°F (-1°C)
July Average	78°F (26°C)
Sunny Days	293 days/yr

Geography

Elevation	435 ft (133 m)
Area	0.4 sq mi (0.9 km²)
Population Density	277/sq mi
Coordinates	38.1760°N, 88.9663°W
Timezone	America/Chicago
County	Jefferson County County
Nearest Airport	Cape Girardeau Regional (CGI) 76 miles away

Precipitation & Snow

Annual Rainfall 46.0"

21% above US avg

Wettest Month (May) 4.49"

Driest Month (Jan) 2.40"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	77.2 / 100
Social Vulnerability	52.8 / 100
Community Resilience	79.1 / 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 High
Lightning	Relatively Low
Ice Storm	Relatively Low
Drought	Relatively Low
Cold Wave	Relatively Low
Landslide	Relatively Low

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

Earthquake History

117 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M5.2.

Apr 18, 2008	7 km NNE of Bellmont, Illinois	M5.2	99 km	14 km
Sep 26, 1990	4 km SE of Chaffee, Missouri	M4.8	127 km	1 km
Apr 18, 2008	9 km NNE of Bellmont, Illinois	M4.7	101 km	15 km
Jun 18, 2002	6 km SW of Parkers Settlement, Indiana	M4.6	108 km	16 km
Feb 5, 1994	2 km WNW of Dongola, Illinois	M4.2	92 km	16 km
Jun 6, 2003	1 km NE of Bardwell, Kentucky	M4.0	144 km	3 km
Apr 21, 2008	7 km NNE of Bellmont, Illinois	M4.0	100 km	18 km
Dec 7, 2000	7 km W of Evansville, Indiana	M3.9	119 km	5 km
Nov 11, 1991	3 km W of Flat Rock, Illinois	M3.8	136 km	0 km
Sep 19, 2017	4 km N of Bellmont, Illinois	M3.8	96 km	12 km
Apr 25, 2008	8 km NNE of Bellmont, Illinois	M3.7	100 km	13 km
Jun 20, 2005	4 km WSW of Blandville, Kentucky	M3.6	139 km	19 km
Nov 20, 2012	7 km N of Bellmont, Illinois	M3.6	98 km	19 km
Jan 2, 2006	3 km NNE of Eldorado, Illinois	M3.6	61 km	7 km
Mar 15, 2017	9 km ESE of Wyatt, Missouri	M3.6	145 km	8 km
May 1, 2016	5 km SE of New Grand Chain, Illinois	M3.5	107 km	16 km
Jul 16, 2004	6 km SE of Wyatt, Missouri	M3.5	147 km	4 km
Mar 2, 1990	9 km NW of Vernon, Illinois	M3.4	77 km	0 km
May 30, 2015	4 km ENE of Geff, Illinois	M3.4	62 km	26 km
Sep 26, 1994	4 km ENE of Blandville, Kentucky	M3.4	135 km	13 km

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

Tornado History

519 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 61 fatalities, 952 injuries.

Date	Rating	Distance	Path	Fatalities
Dec 18, 1957	EF5	27 km	5.4 mi	1
Nov 17, 2013	EF4	50 km	10.6 mi	2
Feb 29, 2012	EF4	60 km	26.1 mi	8
Sep 22, 2006	EF4	94 km	27.5 mi	0
Jun 2, 1990	EF4	62 km	23.0 mi	0
Jun 2, 1990	EF4	44 km	106.0 mi	1
May 29, 1982	EF4	44 km	17.0 mi	10
Dec 18, 1957	EF4	15 km	16.8 mi	1
Dec 18, 1957	EF4	70 km	28.3 mi	11
Jul 9, 2024	EF3	100 km	5.8 mi	0
May 26, 2024	EF3	66 km	4.9 mi	0
Feb 28, 2017	EF3	75 km	44.1 mi	1
Mar 11, 2006	EF3	99 km	53.5 mi	2
Apr 28, 2002	EF3	95 km	19.3 mi	1
Apr 28, 2002	EF3	94 km	22.0 mi	0
Apr 21, 2002	EF3	28 km	31.5 mi	1
Apr 19, 1996	EF3	94 km	11.5 mi	0
Apr 19, 1996	EF3	19 km	17.0 mi	0
Nov 19, 1991	EF3	50 km	1.5 mi	0
Dec 2, 1982	EF3	75 km	10.5 mi	2

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

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (2,286 acres, 2019).

Year	Name	Acres Burned	Distance
2019	UNNAMED	2,286	93 km
2021	RED SHALE UNIT RX	2,123	56 km
2014	UNNAMED	1,627	92 km
2019	ATWOOD RIDGE RX	1,622	92 km
2021	GAP VIEW RX	1,575	84 km
2022	DENNISON HOLLOW RX	1,573	75 km
2021	UNNAMED	1,510	81 km
2022	ONE HORSE GAP RX	1,502	87 km
2014	UNNAMED	1,493	74 km
2015	UNNAMED	1,447	76 km
2021	BEATTY BRANCH RX	1,396	91 km
2016	UNNAMED	1,299	87 km
2024	RED SHALE RX	1,259	58 km
2014	UNNAMED	1,216	87 km
2019	KINKAID RX	1,215	58 km
2013	UNNAMED	1,203	86 km
2022	KINKAID STATE FISH AND WILDLIFE AREA RX	1,115	58 km
2024	PINE HOLLOW RX	1,038	92 km
2021	ROCKY BRANCH RX	1,033	96 km
2021	STATE OF ILLINOIS TRACT RX	1,011	61 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	31°F (-1°C)	2.4 in	Coldest, Driest
February	34°F (1°C)	2.6 in
March	45°F (7°C)	4.2 in
April	55°F (13°C)	4.2 in
May	65°F (18°C)	4.5 in	Wettest
June	74°F (23°C)	3.8 in
July	78°F (26°C)	3.6 in	Warmest
August	76°F (24°C)	3.2 in
September	69°F (21°C)	3.1 in
October	57°F (14°C)	3.0 in
November	46°F (8°C)	4.1 in
December	35°F (2°C)	3.4 in

Nason has a seasonal temperature swing of 48°F / from 31°F in January to 78°F in July. Total annual precipitation is 42.1 inches, with May being the wettest month (4.5") and January the driest (2.4").

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