| April 1972 | Tornado (F2) | not stated | 1 killed, 3 hurt, $250,000 | no account filed |
| August 2020 | Thunderstorm Wind | Forreston | 5 hurt | Straight line winds gusting to 100 mph hit the town of Forreston producing widespread tree and power line damage. Tree and power line damage occurred across 48 blocks of the village and structural damage occurred across 13 blocks. Several mobile homes were damaged or destroyed in two mobile home parks and five people were injured. At least 50 people were displaced. Significant damage occurred to a large metal building near a gas station with associated debris blown toward the northeast. The gas station had its heating and cooling unit ripped off the roof, leaving a hole in the roof. A cinder block wall was blown out of the east side of a building causing minor damage to a parked semi truck. A garage partially collapsed from a fallen tree. Several other roofs suffered some damage from falling tree limbs. A car was damaged by a falling tree limb. |
| April 1974 | Tornado (F1) | not stated | 2 hurt, $250,000 | no account filed |
| April 2010 | Thunderstorm Wind | Rochelle | 1 hurt, $50,000 | Two semi trucks were blown over along Interstate 39 and one on Interstate 88. One driver was taken to the hospital. |
| June 2004 | Lightning | Byron | 1 hurt | A house was struck by lightning and one person was injured. |
| June 1998 | Lightning | Rochelle | 1 hurt | A 27 year old man was injured when lightning struck a nearby tree. |
| April 2015 | Tornado (EF4) | Carthage | $10,000,000 | This is the second segment of the Rochelle-Fairdale EF-4 tornado. At its strongest, peak winds were estimated to be 200 mph which occurred during this segment of the storm. The tornado entered Ogle County just west of IL-38 and moved northeast where it ripped the roof off of a small barn. A neighborhood was hit on S Skare Court where damage was consistent with EF-3. Some of the homes had large sections of the roofs ripped off while some less well constructed homes (nails instead of bolts) had collapsed walls. The tornado continued northeast and intensified to EF-4 where several well constructed homes along South Richard Road and East Kuehl Court were completely destroyed with the slab swept clean. Several outbuildings were destroyed along East Hemstock Road and South Center Road. A residence on East Bethal Road received heavy damage with most of the outer walls collapsing. The tornado once again intensified to EF-4 near IL-251 and IL-64 where well constructed homes were swept clean off their foundation. A farmstead just northeast of the aforementioned intersection was also swept clean to the foundation. A heavy barn was thrown and rolled on East Lindenwood Road. In total, around 30 homes were damaged or destroyed around Rochelle. The tornado continued into Dekalb County just north of East Quarry Road. (Tornado 2b of 7). |
| August 1979 | Tornado (F3) | not stated | $2,500,000 | no account filed |
| August 2008 | Thunderstorm Wind | Mt Morris | $300,000 | Trees as large as two feet in diameter were blown down, some onto houses. Numerous utility poles and power lines were blown down. A phone tower was blown down on the west side of Mount Morris. A grain bin was blown down. Part of a roof was blown off and a building was leveled on the north side of Mount Morris. A barn on Holcomb Road was pushed off it's foundation and destroyed. |
| July 2010 | Flash Flood | Creston | $268,000 | Heavy rain fell across Ogle County on July 23rd and July 24th. The heaviest rains fell during the early morning hours of July 24th. Forreston reported a storm total rainfall of 9.67 inches for both days. Numerous roads and basements were flooded. Several creeks and rivers overflowed their banks, causing additional flooding. A church near Brookville sustained major water damage after the Elkhorn Creek overflowed its banks. |
| June 2009 | Flash Flood | Baileyville | $250,000 | Flash flooding occurred in many parts of Ogle County on June 19th. A few days later, heavy rain once again caused flash flooding across many of the same areas. Some of the more significant flash flooding reports included an apartment building that was flooded in Polo. One family was evacuated. The Lost Nation Bridge was washed out which cut off access to 30 homes. Pines Road at White Pines State Park was totally inundated with two homes sustaining major damage. Several trails in White Pines State Park were washed away or damaged. A small area of railroad tracks were washed out between White Pine State Park and Lake LaDonna Family Campgrounds. Flood water came over a bridge on Flagg Road. Parts of Hoosier Road were washed out. Grist Mill at Stone Hill was closed due to a wash out. Flooding was reported on numerous roads across the county. |
| April 1974 | Tornado (F1) | not stated | $250,000 | no account filed |
| April 2013 | Thunderstorm Wind | Rochelle | $150,000 | Over a dozen semi trucks either jackknifed or flipped onto their side at the Interstate 39 and 88 interchange in southeast Ogle County. A squall line moved across the interstate causing the strong winds. Nearby, at Rochelle Airport winds were measured to 51 mph, while farther east winds were measured to 56 mph at Northern Illinois University in De Kalb. |
| June 2009 | Flash Flood | Baileyville | $100,000 | Ogle County Emergency Management received 40 flash flooding reports during the evening of June 19th. Some of the most significant flooding included a home on Gale Road west of Oregon that was surrounded by fast moving flood waters. A nearby drainage ditch had several feet of fast moving flood water. Thirty campers had to be evacuated through flood waters from the Rock River Marina & Campground on River Road near Oregon where nearly 5 inches of rain was reported. Numerous streets were flooded and closed in Oregon, Polo, and Mt. Morris. Some rural roads between Oregon and Polo were washed out. Damage was reported to several shoulders of rural roads. A restaurant in Oregon had to close due to flooding. The Tracks and Summer Recreation facility on Pines Road was flooded with several feet of water. |
| April 2010 | Thunderstorm Wind | Hazelhurst | $75,000 | A corn crib was completely destroyed along Brookville Road, spilling about 18,000 bushels of corn. A machine shed was also destroyed at the same location. Roof and window damage was reported to other buildings in the area. Trees, tree limbs and power lines were also blown down. Windows were broken on a tractor. |
| May 2011 | Tornado (EF1) | Stillman Vly | $50,000 | A brief tornado took out a dual wood truss electrical transmission line tower, tore off the gable and part of the roof of a house, peeled soffit and shingles from a couple other houses, and knocked down trees and limbs. Truck trailers were also overturned. The tornado was rated EF1 with estimated winds of 90 to 110 mph. |
| May 2011 | Tornado (EF1) | Polo Radio Ranch Arp | $50,000 | The tornado touched down south of unincorporated Polo, just south of the intersection of Union Road and Judson Road. The roof of a cattle shed was blown off along Judson Road. Several beef cattle were in the shed and one was injured severely enough it had to be euthanized. A power pole on the east side of Union Road was blown down, leaning over the road toward the west. At this point the tornado was rated low end EF1 with winds estimated at 85-90 mph. The tornado widened slightly as it progressed to the east along Judson Road, and uprooted a 20 inch diameter fir tree. At this point the tornado was still at EF1 strength, and there were branches down. The tornado then moved east and its width widened to its maximum 200 yards. There was roof damage to sheet metal roofing on 4 buildings and a wood outbuilding that was left leaning over by the tornado. In this area several 2x4s were speared into the ground from different directions and insulation was plastered on the east and northeast face of buildings. Another property just to the northeast of this point experienced six 16 inch diameter Norway Spruce trees snapped off, and a new wood power pole was snapped in half. It was here where the tornado reached its maximum intensity with winds at 100 mph. The tornado continued to the east maintaining its intensity (EF1 strength) another quarter mile to the east where a grain bin was ripped off its foundation and a portion of the roof blown off to the north up against a fence. After this the winds weakened as the tornado lifted. A couple of additional grain bins were blown over, small branches snapped off, and shingles blown off roofs. Winds were estimated at 70-80 mph. The tornado lifted at 10506 Judson Road at Bailey Road. |
| May 2011 | Tornado (EF1) | Forreston | $50,000 | A tornado touched down just east of Forreston, on Columbine Road near Illinois Route 72 in Ogle County. The tornado continued to the northeast with a near continuous path into Winnebago County. A mobile home lost part of its roof with walls partially collapsed in Adeline. Another double wide home lost a portion of its roof on Leaf River Road at Myrtle road. A couple of utility poles were also snapped or leaning over. The tornado crossed into Winnebago County on East Montague Road near South Conger Road. |
| April 2010 | Thunderstorm Wind | Creston | $50,000 | Barns were destroyed and a roof was taken off a cattle shelter near Woodlawn and Fairview. |
| October 2010 | Thunderstorm Wind | Rochelle | $50,000 | Thunderstorm winds caused damage to a hog confinement building. The roof was lifted off and the underlying wood structure was ripped out and deposited in a field. Winds were estimated at 75 to 80 mph. |
| June 2010 | Thunderstorm Wind | Rochelle | $50,000 | Roof damage was reported at a car dealership and at a country club. |
| June 2008 | Thunderstorm Wind | Rochelle | $50,000 | About a dozen big trees were blown down along with 20 to 30 smaller trees. Numerous tree limbs and power lines were also blown down. Part of the roof of a dealership was blown off. A semi-trailer was blown over on Interstate 39. |
| August 2008 | Thunderstorm Wind | Buffalo Grove | $50,000 | A large recreational vehicle was destroyed when half of a large tree fell on it near the intersection of Freeport and Milledgeville Roads. |
| July 2007 | Thunderstorm Wind | Polo | $50,000 | Numerous large tree limbs blown down, some on houses. Damage to sheds, signs and siding. |
| May 1993 | Tornado (F1) | not stated | $50,000 | A small tornado touched down briefly damaging a mobile home, sheds and a swimming pool. Trees were damaged and an empty semi-trailer was blown over. The tornado lifted before Leaf River but trees and power lines were damaged in town by strong thunderstorm winds. |
| April 2010 | Lightning | Rochelle | $30,000 | The Rochelle police department's antenna was struck by lightning. The lightning travelled down the antenna and damaged a police car and then damaged all three of their dispatch stations. |
| April 2010 | Thunderstorm Wind | Buffalo | $25,000 | A grain elevator was damaged at a farm on Canada Road. Part of the elevator fell onto a machine shed and damaged a boat. |
| August 2008 | Thunderstorm Wind | Oregon | $25,000 | A barn was completely blown off its foundation north of Oregon. A cattle trailer was lifted airborne before landing upside down. At least 50 trees suffered significant wind damage. |
| September 2006 | Hail | Mt Morris | $25,000 | Vehicles were reported damaged by hail. |
| May 1988 | Tornado (F1) | not stated | $25,000 | no account filed |
| April 1967 | Tornado (F1) | not stated | $25,000 | no account filed |
| September 1963 | Tornado (F0) | not stated | $25,000 | no account filed |
| August 1959 | Tornado (F1) | not stated | $25,000 | no account filed |
| July 1959 | Tornado | not stated | $25,000 | no account filed |
| May 2009 | Thunderstorm Wind | Mt Morris | $15,000 | The roof of a grain bin was blown off along Lowell Park Road. Debris from the bin was strewn several hundred feet away into a nearby field. A large pine tree near the bin was twisted off and a window of a house was broke. Part of a roof of an apartment building was blown off in downtown Mount Morris. |
| August 2008 | Thunderstorm Wind | Haldane | $15,000 | A police car and a second car, parked next to each other near Route 26 and Haldane Road, were damaged when a tree fell onto them. Many trees were damaged in Haldane and a large antenna was blown down along Route 26. |
| May 2017 | Thunderstorm Wind | Mt Morris | $10,000 | Sheet metal was stripped off of a farm building. Trees six to twelve inches in diameter were blown down. |
| July 2011 | Thunderstorm Wind | Creston | $10,000 | In the town of Creston, two large trees were blown down and three telephone poles were leaning. Corn in the area was flattened. A metal barn was blown over halfway between Malta and Creston on the north side of Route 38. |
| June 2018 | Lightning | Rochelle | $5,000 | Lightning struck a garage and started a fire. |
| July 2017 | Thunderstorm Wind | Monroe Center | $5,000 | Multiple power lines were blown down in northeast Ogle County. |
| June 2017 | Thunderstorm Wind | Stillman Valley | $5,000 | Tree damage was reported with power lines blown down in two mobile home parks near Stillman Road. A commercial seed building was damaged and a propane tank was moved. |
| April 2010 | Thunderstorm Wind | Buffalo Grove | $5,000 | The roof of a hog house was blown off along Eagle Point Road. |
| April 2010 | Thunderstorm Wind | Oregon | $5,000 | Trees, tree limbs and power lines were blown down. One tree fell onto a house. |
| July 2009 | Thunderstorm Wind | Oregon | $5,000 | An eight inch diameter tree limb was blown down onto a house on 4th Street causing minor damage. Live power lines were blown down on 2nd Street. |
| June 2008 | Thunderstorm Wind | Lindenwood | $5,000 | A medium size grain bin was lifted off its foundation and laid over on its side in Lindenwood. |
| August 2007 | Thunderstorm Wind | Mt Morris | $5,000 | Large parts of two trees were blown down, both onto power lines. |
| May 1993 | Thunderstorm Wind | Leaf River | $5,000 | A small tornado touched down briefly damaging a mobile home, sheds and a swimming pool. Trees were damaged and an empty semi-trailer was blown over. The tornado lifted before Leaf River but trees and power lines were damaged in town by strong thunderstorm winds. |
| April 2002 | Hail | Byron | $5,000 | no account filed |
| July 2002 | Thunderstorm Wind | Polo | $5,000 | no account filed |
| June 2010 | Thunderstorm Wind | Oregon | $4,000 | A large tree blew over onto a minivan. |
| August 2012 | Thunderstorm Wind | Oregon | $2,000 | Numerous trees and power lines were blown down. |
| August 2008 | Thunderstorm Wind | Rochelle | $2,000 | A large tree was blown down on Route 38 just east of Route 251. Tree limbs and power lines were blown down across parts of Rochelle. A motorcyclist collided with a tree limb that fell across a road, but no serious injuries were reported. |
| August 2007 | Thunderstorm Wind | Polo | $2,000 | Trees blown down onto power lines. |
| August 2007 | Thunderstorm Wind | Rochelle | $2,000 | A tree limb was blown down onto power lines causing a fire. |
| July 2025 | Flash Flood | Chana | $1,000 | Route 64 was flooded in multiple locations between Skare Road and Interstate 39 and ditches along the road were full of water. Video showed a few inches of water on Route 251 near Route 64. Multiple houses and basements were flooded in Hillcrest and on the north side of Rochelle. Fields at Rochelle Township High School were flooded. The Kyte River overflowed its banks. Approximately 35 acres of corn and soybeans were damaged or destroyed by flood waters. A private weather station near Lindenwood measured 3.20 inches of rain between 20:08 CST and 21:08 CST. |
| August 2010 | Thunderstorm Wind | Polo | $1,000 | A four inch diameter tree was snapped at its base. Power lines were blown down. |
| June 2009 | Thunderstorm Wind | Rochelle | $1,000 | A couple of trees and power lines were blown down. |
| June 2009 | Thunderstorm Wind | Oregon | $1,000 | Trees and power lines were blown down. |
| June 2008 | Thunderstorm Wind | Oregon | $1,000 | A tree was blown down onto power lines which knocked out power to some businesses. |
| June 2008 | Thunderstorm Wind | Davis Jct | $1,000 | Trees and power lines were blown down. |