Weather & Climate in St. Johns, IL

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

St. Johns experiences four distinct seasons with an average annual temperature of 55°F (13°C). Winters average 30°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 42.2 inches. The area receives 11.7 inches of snow annually. Air quality is rated Good with a median AQI of 43. The city sits at an elevation of 460 feet.

Temperature

30°F Jan (-1°C) 77°F Jul (25°C)

Annual Average	55.1°F
	2% above US avg
January Average	30°F (-1°C)
July Average	77°F (25°C)
Sunny Days	293 days/yr

Geography

Elevation	460 ft (140 m)
Area	0.3 sq mi (0.8 km²)
Population Density	184/sq mi
Coordinates	38.0349°N, 89.2386°W
Timezone	America/Chicago
County	Perry County County
Nearest Airport	Cape Girardeau Regional (CGI) 61 miles away

Precipitation & Snow

Annual Rainfall 42.2"

11% above US avg

Snowfall 11.7"

Wettest Month (May) 4.57"

Driest Month (Jan) 2.44"

Air Quality

AQI Median	43.0
Rating	Good

Natural Hazard Risk

Overall Risk	Relatively Low
Risk Score	72.1 / 100
Social Vulnerability	64.1 / 100
Community Resilience	82.2 / 100

Hazard Breakdown

Tornado	Relatively Low
Hurricane	Very Low
Earthquake	Relatively Moderate
Wildfire	Very Low
Flood	Relatively Low
Hail	Relatively Low
Strong Wind	Relatively Moderate
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

137 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	127 km	14 km
Sep 26, 1990	4 km SE of Chaffee, Missouri	M4.8	104 km	1 km
Apr 18, 2008	9 km NNE of Bellmont, Illinois	M4.7	129 km	15 km
Jun 18, 2002	6 km SW of Parkers Settlement, Indiana	M4.6	130 km	16 km
Feb 5, 1994	2 km WNW of Dongola, Illinois	M4.2	74 km	16 km
Jun 6, 2003	1 km NE of Bardwell, Kentucky	M4.0	130 km	3 km
Apr 21, 2008	7 km NNE of Bellmont, Illinois	M4.0	128 km	18 km
Dec 7, 2000	7 km W of Evansville, Indiana	M3.9	141 km	5 km
Feb 21, 2012	4 km SSE of Bertrand, Missouri	M3.9	130 km	8 km
Jun 7, 2011	18 km NNW of Potosi, Missouri	M3.9	146 km	21 km
Sep 19, 2017	4 km N of Bellmont, Illinois	M3.8	124 km	12 km
Mar 2, 2010	2 km ENE of East Prairie, Missouri	M3.7	139 km	8 km
Apr 25, 2008	8 km NNE of Bellmont, Illinois	M3.7	128 km	13 km
Nov 20, 2012	7 km N of Bellmont, Illinois	M3.6	126 km	19 km
Jun 20, 2005	4 km WSW of Blandville, Kentucky	M3.6	125 km	19 km
Jan 2, 2006	3 km NNE of Eldorado, Illinois	M3.6	75 km	7 km
Mar 15, 2017	9 km ESE of Wyatt, Missouri	M3.6	129 km	8 km
May 1, 2016	5 km SE of New Grand Chain, Illinois	M3.5	94 km	16 km
Jul 16, 2004	6 km SE of Wyatt, Missouri	M3.5	130 km	4 km
May 30, 2015	4 km ENE of Geff, Illinois	M3.4	91 km	26 km

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

Tornado History

550 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF5. Total: 61 fatalities, 1,019 injuries.

Date	Rating	Distance	Path	Fatalities
Dec 18, 1957	EF5	5 km	5.4 mi	1
Feb 28, 2017	EF4	76 km	53.5 mi	1
Nov 17, 2013	EF4	47 km	10.6 mi	2
Feb 29, 2012	EF4	64 km	26.1 mi	8
Sep 22, 2006	EF4	65 km	27.5 mi	0
May 6, 2003	EF4	87 km	33.0 mi	2
Jun 2, 1990	EF4	71 km	106.0 mi	1
Jun 2, 1990	EF4	90 km	23.0 mi	0
May 29, 1982	EF4	28 km	17.0 mi	10
Dec 18, 1957	EF4	31 km	16.8 mi	1
Dec 18, 1957	EF4	43 km	28.3 mi	11
May 26, 2024	EF3	54 km	4.9 mi	0
Feb 28, 2017	EF3	99 km	44.1 mi	1
Mar 11, 2006	EF3	71 km	53.5 mi	2
Mar 11, 2006	EF3	96 km	5.1 mi	0
May 6, 2003	EF3	82 km	2.0 mi	0
Apr 28, 2002	EF3	89 km	22.0 mi	0
Apr 28, 2002	EF3	74 km	19.3 mi	1
Apr 21, 2002	EF3	57 km	31.5 mi	1
Apr 19, 1996	EF3	65 km	11.5 mi	0

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	92 km
2021	RED SHALE UNIT RX	2,123	42 km
2014	UNNAMED	1,627	71 km
2019	ATWOOD RIDGE RX	1,622	71 km
2021	GAP VIEW RX	1,575	88 km
2022	DENNISON HOLLOW RX	1,573	83 km
2021	UNNAMED	1,510	81 km
2022	ONE HORSE GAP RX	1,502	91 km
2014	UNNAMED	1,493	83 km
2015	UNNAMED	1,447	84 km
2021	BEATTY BRANCH RX	1,396	91 km
2020	UNNAMED	1,334	91 km
2016	UNNAMED	1,299	91 km
2024	RED SHALE RX	1,259	43 km
2017	UNNAMED	1,257	80 km
2021	OZARK HILL PRAIRIE RX	1,235	80 km
2014	UNNAMED	1,216	91 km
2019	KINKAID RX	1,215	31 km
2013	UNNAMED	1,203	90 km
2022	KINKAID STATE FISH AND WILDLIFE AREA RX	1,115	30 km

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

Monthly Weather

Month	Avg Temperature	Precipitation	Summary
January	30°F (-1°C)	2.4 in	Coldest, Driest
February	35°F (2°C)	2.6 in
March	45°F (7°C)	4.3 in
April	56°F (13°C)	4.1 in
May	65°F (18°C)	4.6 in	Wettest
June	74°F (23°C)	3.9 in
July	77°F (25°C)	3.6 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)	4.1 in
December	35°F (2°C)	3.5 in

St. Johns has a seasonal temperature swing of 47°F / from 30°F in January to 77°F in July. Total annual precipitation is 42.6 inches, with May being the wettest month (4.6") and January the driest (2.4").

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