| April 1997 | Thunderstorm Wind | Sycamore | 1 hurt | no account filed |
| August 2008 | Thunderstorm Wind | Sycamore | $10,000 | Three utility poles were snapped off at their base. A large steel flagpole was bent over. Multiple trees and power lines were blown down. |
| March 2025 | Thunderstorm Wind | Sycamore | - | A tree branch was downed onto a power line near a grocery store in Sycamore. |
| March 2025 | Thunderstorm Wind | Sycamore | - | A large tree fell onto a building causing the roof to collapse. |
| March 2025 | Thunderstorm Wind | Sycamore | - | An evergreen tree was snapped at the trunk. |
| March 2025 | Thunderstorm Wind | Sycamore | - | A rotted pine tree was snapped 15 feet up. |
| March 2025 | Thunderstorm Wind | Sycamore | - | One tree was snapped and another uprooted northeast of Sycamore. |
| March 2025 | Thunderstorm Wind | Sycamore | - | Several live pine trees were snapped a few feet off the ground and facing northeast. |
| March 2025 | Thunderstorm Wind | Sycamore | - | Wind got underneath the garage doors of a farm outbuilding and blew the roof off. Debris was scattered several hundred yards toward the northeast. |
| March 2025 | Thunderstorm Wind | Sycamore | - | The top of a grain silo was blown off and carried to the northeast. |
| March 2025 | Thunderstorm Wind | Sycamore | - | Rotted tree trunks were snapped facing north to north-northeast. |
| March 2025 | Thunderstorm Wind | Sycamore | - | A structure at a ballfield in Sycamore was shifted slightly to the north. Bleachers were also tipped over and light towers were snapped. |
| July 2024 | Thunderstorm Wind | Sycamore | - | Tree damage was reported northeast of Sycamore. |
| July 2023 | Hail | Sycamore | - | A report of one inch hail was received via Spotter Network from south of Sycamore. Time was estimated using radar. |
| August 2022 | Thunderstorm Wind | Sycamore | - | Medium sized tree limbs were blown down. |
| August 2021 | Tornado (EF1) | Sycamore | - | A tornado with peak winds of 105 mph touched down west of Fenstermaker Road and south of Bethany Road. Shortly after touching down, just east of Fenstermaker Road, the tornado produced a concentrated corridor of damage where two farm buildings were nearly completely destroyed. Several trees in the area had trunks snapped near their bases. A single family home suffered some shingle loss along with two broken windows. Drone footage showed the tornado quickly widened to 150 yards as it moved east towards Airport Road, producing tree and crop damage. Farm outbuildings were damaged near Airport Road. Drone footage suggest the tornado lifted near the South Branch of the Kishwaukee River, north of Barber Green Road. |
| August 2021 | Thunderstorm Wind | Sycamore | - | Tree limbs 2 to 3 inches in diameter were blown down. |
| June 2020 | Thunderstorm Wind | Sycamore | - | Numerous large tree limbs were blown down near Freed and Peace Roads. |
| June 2020 | Thunderstorm Wind | Sycamore | - | Numerous trees were blown down between Genoa and Sycamore and a utility pole was on fire. |
| April 2020 | Hail | Sycamore | - | Golf ball size hail was reported at Peace Road and Route 23. |
| September 2018 | Thunderstorm Wind | Sycamore | - | Wind gusts were estimated to 60 mph with isolated tree damage. |
| September 2018 | Thunderstorm Wind | Sycamore | - | A large tree was blown down blocking County Line Road near Barber Greene Road. |
| March 2017 | Thunderstorm Wind | Sycamore | - | Three to four inch diameter tree limbs were blown down near Route 23 and Route 64. |
| June 2014 | Thunderstorm Wind | Sycamore | - | Power lines were blown down near Route 23 and Bethany Road. |
| May 2011 | Thunderstorm Wind | Sycamore | - | Half of a tree was blown down on North Fair Street. |
| April 2011 | Hail | Sycamore | - | Hail to the size of pennies was reported in Sycamore. |
| July 2011 | Thunderstorm Wind | Sycamore | - | Winds were estimated to 60 mph. |
| April 2010 | Thunderstorm Wind | Sycamore | - | Trees were blown down on Barber Greene Road east of Airport Road. |
| June 2010 | Thunderstorm Wind | Sycamore | - | Several eight inch diameter tree limbs were blown down. |
| April 2009 | Hail | Sycamore | - | Marble to penny size hail was reported near Route 23 and Bethany Road. |
| June 2008 | Thunderstorm Wind | Sycamore | - | Tree limbs five inches in diameter were blown down. |
| August 2008 | Thunderstorm Wind | Sycamore | - | A one foot diameter tree was blown down into a house. Multiple six to eight inch diameter tree limbs were blown down across Sycamore. |
| July 2007 | Flash Flood | Sycamore | - | Six inches of water reported on some roads, 1.99 inches of rain measured in 30 minutes south of Kishwaukee Hospital. |
| August 2007 | Flash Flood | Sycamore | - | Many streets closed due to flooding in Mayfield, South Grove, Sycamore. |
| March 2005 | Hail | Sycamore | - | Penny sized hail fell for about 90 seconds on Illinois Rt. 23. |
| July 2005 | Thunderstorm Wind | Sycamore | - | A gust to 70 mph was reported in Sycamore. |
| July 2005 | Lightning | Sycamore | - | A tree was destroyed by a bolt of lightning. |
| July 2024 | Thunderstorm Wind | Sycamore | - | no account filed |
| July 2024 | Thunderstorm Wind | Sycamore | - | no account filed |
| April 2023 | Thunderstorm Wind | Sycamore | - | no account filed |
| April 2020 | Hail | Sycamore | - | no account filed |
| March 2017 | Hail | Sycamore | - | no account filed |
| February 2017 | Hail | Sycamore | - | no account filed |
| March 2012 | Hail | Sycamore | - | no account filed |
| March 2007 | Hail | Sycamore | - | no account filed |
| May 2004 | Hail | Sycamore | - | no account filed |
| August 2001 | Thunderstorm Wind | Sycamore | - | no account filed |
| May 2000 | Hail | Sycamore | - | no account filed |