| February 2014 | Thunderstorm Wind | Alton | 1 hurt | Thunderstorm winds blew a utility pole down in Alton. The pole fell onto an occupied car. One passenger sustained minor injuries. In Bethalto, several large tree limbs and a two foot diameter tree were blown down. |
| August 2005 | Thunderstorm Wind | Alton | $1,000,000 | no account filed |
| June 2022 | Thunderstorm Wind | Alton | $20,000 | Widespread wind damage between Alton and Edwardsville. In Alton, the soffit on a house was partially torn off. Numerous trees, tree limbs and power lines were blown down in Alton, Bethalto, Wood River, Glen Carbon and Edwardsville. |
| August 2022 | Thunderstorm Wind | Alton | $10,000 | Thunderstorm winds blew down several trees near the intersection of 4th Street and Henry Street. Also a large tree was blown over into the front yard, narrowly missing the house. Numerous tree limbs and power lines were blown down around town, including in Oakwood Cemetery. |
| May 2022 | Thunderstorm Wind | East Alton | $5,000 | Thunderstorm winds blew down several large tree limbs. |
| June 1994 | Thunderstorm Wind | East Alton | $5,000 | Ham radio spotters reported six to eight inch tree limbs snapped off and power lines down at East Alton along with gusts to 60 mph. The county sheriff also reported trees and power lines down from Worden to Holiday Shores between 1715 and 1725 CST. One lightning strike in East Alton caused a tree to catch fire. |
| May 1995 | Thunderstorm Wind | Alton | $1,400 | Ham radio spotters reported power lines and poles down in Alton. Tree limbs up to five inches in diameter were snapped off in East Alton several minutes later. |
| June 1994 | Thunderstorm Wind | East Alton | $500 | Ham radio spotters reported six to eight inch tree limbs snapped off and power lines down at East Alton along with gusts to 60 mph. The county sheriff also reported trees and power lines down from Worden to Holiday Shores between 1715 and 1725 CST. One lightning strike in East Alton caused a tree to catch fire. |
| June 1994 | Thunderstorm Wind | East Alton | $500 | Ham radio spotters reported six to eight inch tree limbs snapped off and power lines down at East Alton along with gusts to 60 mph. The county sheriff also reported trees and power lines down from Worden to Holiday Shores between 1715 and 1725 CST. One lightning strike in East Alton caused a tree to catch fire. |
| June 1994 | Thunderstorm Wind | East Alton | $500 | Ham radio spotters reported six to eight inch tree limbs snapped off and power lines down at East Alton along with gusts to 60 mph. The county sheriff also reported trees and power lines down from Worden to Holiday Shores between 1715 and 1725 CST. One lightning strike in East Alton caused a tree to catch fire. |
| November 1994 | Thunderstorm Wind | Alton | $300 | The county sheriff reported scattered large trees and power lines down between Alton and Holiday Shores, across the northern part of the county. |
| June 1995 | Thunderstorm Wind | Alton | $266 | Large tree limbs and power lines were knocked down at Godfrey. As the storm hit Alton, large trees fell demolishing a bandstand and heavily damaging at least three homes. |
| March 2026 | Hail | East Alton | - | Quarter sized hail was reported in Wood River by Madison County SKYWARN. |
| July 2023 | Thunderstorm Wind | East Alton | - | Thunderstorm winds blew down numerous large tree limbs around town as well as a few power lines. |
| August 2020 | Thunderstorm Wind | Alton | - | Thunderstorm gust front winds blew down numerous large tree limbs in the Alton and Wood River areas. |
| April 2017 | Thunderstorm Wind | Alton | - | Thunderstorm winds blew down numerous tree limbs around town. Also, a few trees were either uprooted or snapped off. |
| October 2017 | Thunderstorm Wind | East Alton | - | Thunderstorm winds blew down several large tree limbs. |
| April 2016 | Thunderstorm Wind | East Alton | - | Thunderstorm winds blew down several large tree limbs around town. |
| July 2016 | Thunderstorm Wind | Alton | - | As a line of severe storms moved through northern Madison County, numerous trees, tree limbs and power lines were blown down between Alton, Worden and Alhambra. |
| July 2014 | Thunderstorm Wind | North Alton | - | Thunderstorm winds blew down a large tree as well as large tree limbs in Godfrey. |
| April 2013 | Thunderstorm Wind | East Alton | - | Thunderstorm winds blew down numerous large tree limbs around Wood River and snapped a power pole. |
| June 2011 | Thunderstorm Wind | Alton | - | Thunderstorm winds blew down several power lines in town. |
| April 2011 | Hail | Alton | - | Large hail was reported in Alton, Wood River, and Roxana. |
| September 2011 | Thunderstorm Wind | East Alton | - | Thunderstorm winds blew down a large tree and snapped a telephone pole. |
| May 2010 | Flash Flood | Alton | - | Between 2 and 3 inches of rain fell in a short amount of time on already saturated soils causing flash flooding. Several roads were flooded including Harris Lane between Fosterburg Road and Seminary Street. |
| June 2010 | Thunderstorm Wind | East Alton | - | Thunderstorm winds blew down numerous large tree limbs around town. |
| July 2010 | Thunderstorm Wind | Alton | - | Thunderstorm winds blew down several large trees as well as numerous tree limbs in Alton. One tree fell onto a car causing major damage and landed on two homes causing moderate roof damage. A couple of tree limbs landed on power lines around town causing power outages. |
| May 2009 | Thunderstorm Wind | Alton | - | A downburst moved through portions of Alton, blowing down the third story of an old brick building on East Broadway. Some of the bricks and debris were thrown onto the roofs of adjacent buildings. Further down the block the winds blew in a wall of an abandoned lumber company's metal storage building. Numerous vehicles in the area sustained damage from the flying debris as well. Several large trees in the area were blown over as well. One tree fell onto the roof of a house causing minor damage. No one was injured due to this event. |
| September 2008 | Flash Flood | Alton | - | Flash flooding occurred when very heavy rainfall from the remnants of Hurricane Ike fell onto already saturated soils. Between 3 and 5 inches of rain fell in just under 6 hours. Numerous roads were flooded throughout the county. Some towns affected by the flooding were Alton, Fosterburg, Troy, Edwardsville and Granite City. East Lake Drive near Gerber Road was washed out in Edwardsville. In East Alton, a home was flooded on Tomilson Avenue. Near Hamel, 12 girl scouts and 4 adults leaders had to be rescued from a girl scout camp when flood waters washed out a bridge to the campground. Also, 2 people had to be rescued from their mobile home due to Wood River Creek flooding the surrounding area northeast of Alton. Numerous other water rescues occurred due to people driving into flooded roadways. |
| July 2007 | Hail | Alton | - | The public reported 3/4 inch hail. |
| June 2007 | Hail | Alton | - | Storm spotters reported nickel size hail. |
| August 2007 | Thunderstorm Wind | Alton | - | Co-op observer at the Alton Lock and Dam reported 60 mph winds. |
| July 2006 | Thunderstorm Wind | Alton | - | Numerous large trees were blown down in town. Some were up to two feet in diameter. |
| April 2005 | Hail | Alton | - | Storm spotters reported a brief period of 3/4 inch hail. |
| May 2004 | Thunderstorm Wind | Alton | - | Local law enforcement reported a large tree down in Cottage Hills. |
| August 2004 | Lightning | Alton | - | Lightning hit an electric substation knocking out power to about 12,000 Alton residents. |
| August 2004 | Tornado (F0) | Alton | - | A small tornado caused a 1 1/4 mile damage path in northeast Alton. Trees were downed at a golf course and a shoe store suffered roof damage. |
| March 2002 | Hail | Alton | - | A local television station reported 3/4 inch hail just east of Alton. |
| May 2001 | Thunderstorm Wind | Alton | - | A fast moving line of thunderstorms caused some wind damage in the Alton area. Some trees were down blocking a few roads. There was minor damage to a few decks and backyard pools caused by falling tree limbs. |
| August 2001 | Thunderstorm Wind | Alton | - | Amateur radio spotters reported trees uprooted at the intersection of Davenport and State Street. 5 to 6 inch limbs were also snapped off trees. |
| April 2000 | Hail | Alton | - | Storm spotters reported hail up to golfball size in the Alton area. |
| May 1995 | Thunderstorm Wind | East Alton | - | Ham radio spotters reported power lines and poles down in Alton. Tree limbs up to five inches in diameter were snapped off in East Alton several minutes later. |
| May 1995 | Hail | Alton | - | Several large trees were knocked down in Granite City. |
| April 2026 | Hail | Alton | - | no account filed |
| April 2026 | Hail | East Alton | - | no account filed |
| May 2018 | Hail | East Alton | - | no account filed |
| October 2016 | Hail | Alton | - | no account filed |
| April 2014 | Hail | East Alton | - | no account filed |
| April 2013 | Hail | East Alton | - | no account filed |
| May 2012 | Hail | Alton | - | no account filed |
| October 2012 | Hail | East Alton | - | no account filed |
| March 2012 | Hail | Alton | - | no account filed |
| March 2012 | Hail | East Alton | - | no account filed |
| June 2011 | Hail | Alton | - | no account filed |
| April 2011 | Hail | East Alton | - | no account filed |
| May 2011 | Hail | Alton | - | no account filed |
| July 2009 | Hail | Upper Alton | - | no account filed |
| May 2009 | Hail | Alton | - | no account filed |
| May 2009 | Hail | Alton | - | no account filed |
| May 2009 | Hail | Alton | - | no account filed |