| February 1956 | Tornado (F4) | not stated | 6 killed, 20 hurt, $2,500,000 | no account filed |
| May 1968 | Tornado (F3) | not stated | 4 killed, 60 hurt, $250,000 | no account filed |
| November 1989 | Thunderstorm Wind | not stated | 1 killed, 20 hurt | no account filed |
| April 2006 | Tornado (F2) | Fairview Hgts | 1 killed, 11 hurt | Around 515 pm CDT the tornado first caused damage 200 yards south of the intersection of Union Hill road and Long Acre Drive in southwest Fairview Heights, Illinois. Several large trees and large limbs were downed by the tornado. The damage width at this location was 60 yards wide while damage intensity was rated F0. The tornado traveled northeast through a small subdivision southwest of Lincoln Trail (US 50) and Cathy Lane. There was minor roof damage to several homes, a two car garage was damaged and several large trees were either uprooted or snapped half way up. On the east side of Cathy Lane the roof of an apartment building was damaged while a second establishment sustained side and roof damage. Damage was rated F1 intensity while the damage width ranged from 60 to 80 yards. On the north side of US 50 several large power poles were snapped off. Other establishments along the north side of US 50 sustained various degrees of damage. Light poles and tree damage revealed a convergent damage pattern indicative of a tornado. The tornado then hit the south side of the K & G clothing store. The front center part of the roof collapsed while debris from this area was pushed along the east side of the large store. There was one fatality and 11 injuries at this store. The damage width ranged between 80 to 100 yards in this area while the damage intensity was rated lower end of F2. The tornado continued northeast across St. Clair Square Mall, Interstate 64, and then hit a church on Old Collinsville Road. The tornado damaged the steeple and roof of the church. The tornado then damaged three homes and one farm just west of the intersection of Milburn School Road and Pausch Road 2 miles northeast of Fairview Heights. Several large trees were also damaged over this area. The damage width was approximately 60 yards wide while damage Intensity was rated F1. The tornado then crossed the intersection of Kyle and Simmons Road and caused only minor roof damage to six homes in a subdivision north of Kyle Road. The tornado continued to travel northeast and caused damage to several homes in the Crown Point subdivision just south of O`Fallon-Troy Road. The roof of one home was completely uplifted and tossed over 100 yards to the northeast. The damage width was 100 yards wide while damage intensity was rated F2. The tornado then crossed O`Fallon-Troy Road and totally destroyed a machine shed at a farm. Debris from the machine shed was tossed over 1/3 mile to the northeast. Two other homes 1/4 mile north of the intersection of Weil and O`Fallon road sustained varying degrees of damage. The roof of one home was uplifted and displaced to the northeast. Several trees in this area were also damaged. The width of the tornadic damage was 100 yards while damage intensity was rated F1. Insulation debris from both homes was tossed over 300 yards across an open field and line of large trees. The total tornadic damage track was approximately 7 miles. This tornado was a type referred to as a non-supercell tornado. Given that the line of thunderstorm which produced this tornado was moving 60 mph, the tornado was only on the ground for about 8 minutes. |
| April 1958 | Tornado (F3) | not stated | 1 killed, 8 hurt, $250,000 | no account filed |
| February 2001 | Lightning | Paderborn | 1 killed | no account filed |
| May 1983 | Tornado (F2) | not stated | 20 hurt, $2,500,000 | no account filed |
| April 2026 | Thunderstorm Wind | Belleville | 3 hurt | Thunderstorm winds blew a tree onto a home 2 miles southeast of Belleville. Three individuals sustained injuries. Near Swansea and at Scott Air Force Base, winds downed large tree limbs. A report of an estimated 55 mph wind gust was reported in Swansea, but winds were likely stronger based on the damage. |
| March 2025 | Thunderstorm Wind | O Fallon | 2 hurt, $150,000 | Thunderstorm winds caused a home to collapse with two elderly residents inside. |
| March 2025 | Thunderstorm Wind | Lebanon | 2 hurt, $35,000 | The St. Clair County emergency manager reported an overturned mobile home with residents trapped inside. |
| June 2003 | Tornado (F2) | Caseyville | 2 hurt | A tornado first caused damage along the west side of the town of Caseyville, Illinois along Forest Blvd, just east if Interstate 255. Over twelve witnesses observed the tornado along the leading edge of the bowing squall line as they saw debris tossed several hundred feet into the air. The tornado traveled east southeast along Forest Blvd and West Lincoln Avenue. Three house trailers were severely damaged by the tornado between 85th and Black Lane. Two injuries occurred in two of the three house trailers. Numerous large trees were severed or downed by the tornado. The roof of a large machine shed on Black Lane was uplifted and displaced several hundred yards to the east. The tornado then ripped through an auto salvage area where several vehicles were over-turned, damaged or destroyed. The width of this damage area was 50 to 100 yards wide while damage intensity was rated F1. The tornado continued to travel just a bit south of due east causing damage to two homes and a camper and completely destroying another mobile home. Some of the remains of the mobile home was observed 3/4 mile to the east just west of Highway 157. Pieces of metal were wrapped around snapped power poles while one 2 x 4 board was driven into the front windshield of a pickup truck. The width of this damage area varied from 50 to 75 yards while the damage intensity was rated low-end F2. The tornado continued east and showed a convergence pattern in a nearby wheat field south of West Lincoln Ave. The tornado then caused minor damage to six new homes 100 to 300 yards south of West Lincoln Ave and 1/4 to 1/2 mile west of Highway 159. Roofs from five homes were partially uplifted and tossed 200 to 400 yards downwind to the east. One home under construction was completely destroyed. The width of the damage area varied from 75 to 150 yards. The damage intensity was rated the lower end of F1. The tornado continued east up a ridge just east of Highway 157. Several large trees were snapped or uprooted just east of 157. Additional tree damage was found along Hill Road east of Highway 157. One home on Hill Road sustained minor roof damage. The tornado crossed East O'Fallon Drive and severed or uprooted several large trees. One home sustained minor roof damage while a machine shed and garage was severely damaged. The tornado damage track ended just west of Highway 159. Width of the damage area again varied from 75 to 100 yards while the damage intensity was rated at the lower end of F1. |
| June 2000 | Tornado (F1) | Millstadt | 2 hurt | At approximately 240 pm CDT, a tornado formed west northwest of Millstadt near the intersection of Bluffside and Metter Roads. Several large trees were downed and a cattle barn extensively damaged. The tornado moved east northeast causing mainly tree and power line damage and then turned more east entering the Triple Lakes Golf Club. One home, 2 large utility buildings and the clubhouse suffered varying degrees of damage. The tornado became multiple vortex in nature at this point producing 2 distinct damage paths. Numerous large trees were uprooted or downed while the tornado continued through the golf course. The tornado continued on an east path downing trees and power lines, crossing Route 163 to about 2 1/4 miles northeast of Millstadt and dissipating. There were 2 minor injuries that occurred while the tornado went through the golf course. A man suffered a back injury when the golf cart he was riding in overturned. Another man suffered minor injuries from flying debris. |
| September 1961 | Tornado (F2) | not stated | 1 hurt, $25,000 | no account filed |
| March 2025 | Thunderstorm Wind | Stolle | 1 hurt | Thunderstorm winds felled a tree in Cahokia Heights. This tree fell on a house on Melvin Drive, injuring a 9 year old girl. |
| June 2002 | Lightning | Belleville | 1 hurt | A man suffered minor injuries from a lightning strike. The lightning apparently struck a power pole he was walking by. He suffered minor bruises and burns on his neck. Power was knocked out to several nearby businesses. |
| June 2002 | Thunderstorm Wind | Lebanon | 1 hurt | no account filed |
| July 2022 | Flash Flood | East Carondelet | $10,000,000 | Up to 9 inches of rain fell in a 6 to 10 hour period causing widespread flash flooding. The heaviest rain axis extended from East St. Louis southeastward towards Mascoutah. Numerous roads were flooded, including northbound I-55 at I-64, ramps from I-64 to I-255, U.S. Highway 50 between O'Fallon and Lebanon, and Illinois Route 15 near intersection with Frank Scott Parkway. Several water rescues were performed including on Illinois Route 15 at Karch Road, east of Freeburg and on West F Street near North 3rd Street in Belleville. An estimated 600 St. Clair County households were damaged by flash flooding. The St. Clair County Animal Shelter was flooded in Belleville so several dozen dogs and some cats had to be evacuated and placed in other shelters or homes temporarily. Overall, no injuries were reported in St. Clair County. |
| June 2019 | Flood | Venice | $8,100,000 | The Mississippi River at Alton, IL remained at it's highest levels between the evening of June 2nd and the evening of June 12th. There was at least $8.1 million in damage to the infrastructure along the Mississippi River due to the river flooding in St. Clair County. |
| July 1992 | Tornado (F1) | not stated | $2,500,000 | no account filed |
| November 1988 | Tornado (F3) | not stated | $2,500,000 | no account filed |
| September 2001 | Thunderstorm Wind | East St Louis | $600,000 | Thunderstorm wind gusts of 75 to 80 mph hit the RV park at the Casino Queen overturning 6 recreational vehicles. Nine people were injured. Six were treated for minor injuries and released and 3 were kept overnight for observation. One of the RV's was overturned onto a vehicle, destroying both. |
| March 2025 | Tornado (EF1) | Mascoutah | $260,000 | At approximately 10:30 PM, a tornado began near Scheve Park in Mascoutah. In Mascoutah the tornado caused roof damage to multiple residences as well as the local high school. Power poles and outbuildings were damaged as well. The most intense damage in town occurred near the intersection of Beechcraft Blvd and Fuesser Rd. The tornado continued northeast where it damaged a grain elevator and more farm outbuildings. The most significant damage in the county occurred near the Madison/Clinton County border where farm outbuildings were completely destroyed and residences sustained heavy roof and window damage. The tornado then crossed into Clinton County. In St. Clair County the tornado was rated EF-1 with a path length of 7.88 miles and a maximum path width of 700 yards. |
| November 1988 | Tornado (F2) | not stated | $250,000 | no account filed |
| April 1984 | Tornado (F0) | not stated | $250,000 | no account filed |
| March 1976 | Tornado (F2) | not stated | $250,000 | no account filed |
| October 1955 | Tornado (F1) | not stated | $250,000 | no account filed |
| July 2000 | Flood | Fairview Hgts | $200,000 | Heavy rain caused some localized flooding in Fairview Heights. A 30 by 35 foot section of roof on a department store at a shopping mall collapsed under the weight of about 3 inches of rain. About a foot of water on Route 159 stranded several motorists. |
| March 2025 | Tornado (EF1) | O Fallon | $150,000 | At approximately 10:28 PM a tornado began in the northeastern outskirts of O'Fallon, IL where it caused damage to multiple mobile homes, single family homes, outbuildings, and trees along its track northeast. The tornado then passed into southern Madison County. In Madison County the tornado was rated EF-1 with a path length of 6.75 miles and a maximum path width of 770 yards. In St. Clair County the tornado was rated EF-1 with a path length of 5.9 miles and a maximum path width of 450 yards. |
| June 1999 | Thunderstorm Wind | Fairview Hgts | $100,000 | no account filed |
| May 2022 | Thunderstorm Wind | Belleville | $60,000 | Thunderstorm winds blew off part of the roof of a church on East Main Street near intersection with Walnut Street. Also, numerous tree limbs were blown down around Belleville. A large tree was blown onto a house in Shiloh causing moderate roof damage. |
| May 2024 | Thunderstorm Wind | Dupo | $50,000 | With this storm, and airline pilot measured an 81 mph wind gust at an aviation flight park near Millstadt. This storm was responsible for trees on homes in Dupo and Swansea. It also knocked down multiple trees and tree limbs in Belleville. By the time the storm reached Scott Air Force Base, wind gusts dropped to 61 mph as measured by the KBLV AWOS. |
| May 2022 | Thunderstorm Wind | Douglas | $50,000 | Widespread wind damage around Freeburg. About 2 miles south southwest of Freeburg, a machine shed was mostly destroyed. On the west side of Freeburg, several homes sustained roof damage from fallen trees and tree limbs. Also, numerous power lines were blown down. |
| May 2022 | Thunderstorm Wind | Lebanon | $50,000 | Thunderstorm winds blew off part of the roof of a house into a tree approximately 100 yards away. |
| October 2021 | Thunderstorm Wind | Swansea | $50,000 | A swath of damaging winds occurred over St. Clair County from Swansea through O'Fallon, Scott AFB, and Mascoutah. Several large trees were blown down. The roof of a storage building was blown off at Air Force Base Storage. The debris landed on a house east of the storage building near the intersection of Illinois Route 161 and Hannah Chase Court. In Mascoutah, a pole barn was lifted and flipped, landing on a nearby business about 30 feet to the east. |
| June 1997 | Thunderstorm Wind | Freeburg | $50,000 | Wind gusts estimated at 75 mph downed trees, power lines, and damaged roofs. The roof of one busines was completely blown off. |
| April 1994 | Thunderstorm Wind | Floraville | $50,000 | Dime-size hail was reported along with wind gusts to 40 mph in Dupo. Trees were also blown down in Floraville damaging several homes while one-inch hail was reported in Millstadt. |
| April 1994 | Thunderstorm Wind | New Athens | $50,000 | Power lines and poles were blown down just east of Freeburg. The county sheriff also reported several large trees down in New Athens which damaged parked cars. |
| August 1993 | Thunderstorm Wind | Belleville | $50,000 | County officials reported trees and power lines down in Cahokia. A large warehouse roof was later damaged from high wind. |
| March 2025 | Thunderstorm Wind | Lebanon | $35,000 | Thunderstorm winds destroyed a mobile home. |
| April 2025 | Flash Flood | Darmstadt | $30,000 | A water rescue took place on Illinois Highway 13 near Lenzburg due to a vehicle being stranded in flood water. Heavy rain of up to 5.25 to 6.1 inches fell in St. Clair County during the duration of the event. |
| July 2002 | Lightning | Cahokia | $30,000 | A lighting strike started a fire which destroyed a double wide mobile home in Cahokia. The woman resident along with her 3 dogs and 2 cats escaped without injury. |
| July 2025 | Flash Flood | Summerfield | $25,000 | Heavy rain caused flash flood conditions on Route 13 south of Freeburg where 4 to 5 feet of water flooded the road. One car also stalled in water on US-50 west of Trenton where both directions were flooded. |
| July 2025 | Flash Flood | Summerfield | $25,000 | A home in Ramsey saw significant basement flooding, including walls being knocked down by flood waters. |
| November 1990 | Tornado (F0) | not stated | $25,000 | no account filed |
| April 1957 | Tornado (F2) | not stated | $25,000 | no account filed |
| September 1956 | Tornado (F2) | not stated | $25,000 | no account filed |
| October 1955 | Tornado (F1) | not stated | $25,000 | no account filed |
| May 1952 | Tornado (F1) | not stated | $25,000 | no account filed |
| April 2024 | Thunderstorm Wind | Sugarloaf Hgts | $20,000 | There were numerous reports of tree branches up to 3 inches in diameter snapped and broken power poles with downed lines. |
| February 2023 | Thunderstorm Wind | Centerville | $20,000 | Thunderstorm winds peeled part of the roof off of a warehouse near the Gateway Grizzlies stadium. |
| April 2023 | Thunderstorm Wind | Shiloh | $20,000 | Thunderstorm winds blew down a row of power lines along Illinois Route 158 on the west side of Scott Air Force Base. |
| June 2022 | Thunderstorm Wind | Monsanto | $20,000 | Widespread wind damage across the northern portions of St. Clair County. Numerous trees, tree limbs and power lines were blown down in Centreville, Fairview Heights, Belleville, and O'Fallon. One large tree branch fell onto a house in O'Fallon causing moderate roof damage. |
| July 2021 | Thunderstorm Wind | Mascoutah | $20,000 | Thunderstorm winds blew down numerous large tree limbs, up to 12 inches in diameter, throughout Mascoutah. A utility pole was snapped off at its base. A couple of trees, as well as numerous tree limbs, were snapped off along Highbanks Road. A flag pole was also bent. |
| May 2008 | Flash Flood | Freeburg | $20,000 | Heavy rain caused flash flooding at several locations in the central part of St. Clair County. Roads were reported closed in Belleville, Freeburg, and Smithton. Some basements were reported flooded with up to two feet of water. |
| July 1996 | Lightning | Belleville | $20,000 | no account filed |
| August 2021 | Thunderstorm Wind | Caseyville | $15,000 | Thunderstorm winds blew a large tree onto an unoccupied car causing moderate damage. |
| May 1995 | Thunderstorm Wind | Mascoutah | $15,000 | The roof of an apartment complex collapsed after being damaged from high winds. Numerous large trees and power lines were blown down through out the Mascoutah area. Reported by ham radio spotters. |
| April 2025 | Tornado (EF0) | Floraville | $10,000 | A brief and weak tornado touched down on Schwab Road, southwest of Millstadt at 8:14 PM. It destroyed an outbuilding and produced tree damage along Schwab Road with winds estimated as high as 85 mph. The tornado dissipated shortly thereafter at 8:15 PM. The tornado was rated EF-0 with a path length of 0.75 miles and a maximum path width of 100 yards. |
| April 2025 | Tornado (EF0) | St Libory | $10,000 | What was likely a very brief tornado touched down somewhere in a field just north of the community of St. Libory and lifted shortly thereafter. Damage surveys revealed that a two-door garage/shed was destroyed, but surrounding trees and homes were largely untouched aside from a tipped over RV/trailer approximately 1 mile downstream. Given the very narrow scope of the damage, and the fact that debris from the destroyed garage was strewn several hundred yards downstream, it is more likely than not that this was a brief tornado, rather than straight-line winds. The tornado was rated EF-0 with a path length of 0.45 miles and a maximum path width of 25 yards. |
| April 2025 | Thunderstorm Wind | Dupo | $10,000 | Thunderstorm winds downed a few power lines on Main Street in Dupo. |