| April 1965 | Tornado (F1) | not stated | 40 hurt, $2,500,000 | no account filed |
| June 1979 | Tornado (F2) | not stated | 5 hurt, $250,000 | no account filed |
| July 1996 | Flash Flood | Browntown | 1 hurt, $6,000,000 | no account filed |
| August 2000 | Thunderstorm Wind | Dayton | $1,500,000 | no account filed |
| June 2008 | Flash Flood | Browntown | $1,320,000 | Heavy rains resulted in flash flooding across much of Green County. Water depths on road surfaces reached 3 feet or more and there were gravel washouts. Some farm fields remained flooded into early July. The breakdown for residential home losses were: 109 with minor damage, 12 with major damage, and 1 destroyed (total of $750 thousand for home losses). There were no business losses. Farm buiding losses were: 1 with minor damage, 2 with major damage, and 4 destroyed (for a total of $195 thousand in farm building losses). Crop losses were estimated at $20 million. Public sector damage was about $373.3 thousand. There were several roads and bridges that sustained damage. |
| March 2023 | Tornado (EF1) | Oakley | $600,000 | Tornado started south of Juda and tracked to the east of the city before going to the west of Decatur Lake. Most of the damage was along County Road F where a number of farm outbuildings were damaged, particularly to roofs. Some areas had power lines that were snapped due to the wind. |
| February 2024 | Tornado (EF1) | Juda | $500,000 | Damage was mainly to small barns and outbuildings though one home south of Albany took a hit and lost it's roof. Condensation funnel may not have been visible for much of the life of the tornado until it's end near Albany. |
| March 2023 | Tornado (EF0) | Twin Grove | $400,000 | Tornado tracked through mainly rural areas and did damage to some barns with a roofing structure severely damaged near Brunkow Road. |
| August 2007 | Flash Flood | Browntown | $400,000 | Several rounds of thunderstorms with heavy rains on top of a saturated ground resulted in another round of scattered flash flooding across Green County. At least another 150 residents sustained water damage to basement contents and/or basement walls. Two homes in Browntown had basements on the verge of collapsing. One farm home near Brooklyn had 5 feet of water in the basement and the basement walls cracked. Two silos on the same property had cracking due to water accumulation. In the city of Brodhead, a sink hole developed which resulted in the sewer system collapsing at that location. Road damages (gravel washouts or culverts) were scattered around the county, and totaled 91,000. Several roads were closed over the eastern third of the county due to either fast-flowing water or high water levels. Many other roads across the county had at least 6 inches to 1 foot of fast flowing water covering them. About 20 homes in Albany had basement flooding and sewage backups and needed to be pumped out. In some cases water depths were almost to the basement ceiling! Several homes and businesses in New Glarus had sewage backups. A home on CTH Y near Monroe had a partial collapse of two basement walls. A mudslide occurred on CTH M just south of Jordon Center. Soil erosion and crop damage was also noted. Refer to the August 18-19, 2007, Flash Flood event for Green County for related information.||August, 2007, rainfall totals include: 15.57 at Brodhead, 15.43 in Monroe, and 20.20 in New Glarus. |
| August 2007 | Flash Flood | Dayton | $400,000 | Flash flooding occurred in scattered locations between the northeast corner around Dayton down to the Brodhead area. Fast-flowing water of depths to 1 to 2 feet covered several roads in this area. In the Civil Town of Decatur, CTH F and CTH E were closed. In the Civil Town of Albany, Tin Can road between Zurfluh and CTH EE, CTH X at River Bridge, and River Road were closed. Some mudslides, soil erosion, and crop losses were also noted. At least 100 homes had some water damage to basement contents. WSR-88D Doppler overnight rainfall estimates ranged from around 3 inches over the southwest corner of the county to 5 to 6 inches over the northeast corner. |
| June 2000 | Flash Flood | Countywide | $400,000 | no account filed |
| June 2017 | Tornado (EF1) | Stearns | $325,000 | Along the path of the tornado, a barn and pole shed were destroyed, 4 houses sustained damage, 4 power poles were snapped, numerous trees were either snapped or uprooted and a camper was rolled into a pond. The majority of the tornado path had EF-0 damage, but there were pockets of EF-1 damage. |
| June 2014 | Tornado (EF1) | Clarno | $300,000 | Numerous large trees uprooted and snapped. Severe damage to several barns, and sheds of various sizes destroyed. Straight line wind damage likely occurred to the right of the tornado path with tree and shed damage in various locations. |
| June 2014 | Thunderstorm Wind | Juda | $300,000 | Roof damage to a couple pole barns, and two very small sheds destroyed. Numerous trees down in the cities of Juda and Brodhead. At least 60 homes damaged from fallen trees in Brodhead. |
| September 1972 | Tornado (F1) | not stated | $250,000 | no account filed |
| June 1969 | Tornado (F2) | not stated | $250,000 | no account filed |
| January 1967 | Tornado (F3) | not stated | $250,000 | no account filed |
| July 1999 | Thunderstorm Wind | Albany | $225,000 | no account filed |
| March 2023 | Tornado (EF0) | Brodhead | $200,000 | Tornado started just south of Decatur Lake and tracked to the north through Decatur Lake Golf Course, causing some minor tree damage. Further to the north, a barn had roof damage with a number of sheets of metal lofted off of the building. Tornado tracked into a small portion of Rock County before disapating. |
| June 2014 | Tornado (EF1) | Postville | $200,000 | Tornado damage to farmsteads along Hay Hollow Road. Significant damage to farm buildings. 2 homes sustained major damage with 24 homes sustaining minor damage. Numerous large trees down. Estimated wind speed up to 95 mph. |
| June 2011 | Thunderstorm Wind | Monroe | $200,000 | This was a heat burst - generated by a decaying convective rain shower band which resulted in evaporation of most of the rain that caused gusty southwest winds and rising temperatures of 10 to 20 degrees F. Large trees were blown down in Albany, and 2 buildings in Monroe were damaged. Additionally, there were scattered reports of broken power poles and power lines. The damage swath was about 5 miles wide. |
| April 2002 | Thunderstorm Wind | Browntown | $200,000 | no account filed |
| July 2017 | Flood | Browntown | $172,000 | The Pecatonica River in Martintown crested at 18.45 ft. which is moderate flood stage. Some homes in the Martintown area have floodwaters in their basements and first floors. In total, 8 homes had either very minor or minor flood damage, with 3 homes having major flood damage. One business in Browntown suffered major flood damage. Portions of Martintown Road, West River Road, and Babler Road are flooded. A portion of Zimmerman Lane was washed out. Upstream in Browntown, Highway MM and West Indies Road are flooded. |
| June 2017 | Tornado (EF1) | Stearns | $145,000 | A short lived tornado removed a portion of the roof from two industrial buildings and broke multiple windows in each building. Elsewhere, a trailer was flipped and multiple trees were either snapped or uprooted. A dumpster was also lifted and blown across Highway 69. |
| February 2018 | Flood | Browntown | $120,000 | The Pecatonica River in Martintown crested at 20.07 ft., which is moderate flood stage.|Some homes in the Martintown area have floodwaters in their basements and first floors; Martintown Road and West River Road in Martintown are flooded as is Highway 73 about 1 mile downstream in Winslow, Illinois. Highways MM and West Indies Road upstream in the Browntown area are flooded. Road damage did occur to some of the flooded roads and will require repair. |
| May 1999 | Flash Flood | Countywide | $120,000 | no account filed |
| June 2014 | Thunderstorm Wind | Jordan | $100,000 | A sporadic to sometimes continuous path of straight line wind damage from the rotating comma head of the large scale bow echo. Numerous trees down. A barn down and several sheds damaged, including torn off roofs. Minor damage to a home. A grain bin destroyed. |
| May 2012 | Thunderstorm Wind | Brodhead | $100,000 | The Green County Emergency Manager reported $100,000 of damage from severe thunderstorm winds 4 miles southwest of Brodhead. The damage included 2 barns/sheds with one losing it's roof to the powerful winds. The severe winds peeled siding off of one home, and broke windows and pushed in the door on another home. |
| May 2004 | Flash Flood | New Glarus | $100,000 | A mudslide destroyed freshly planted crops and some basements were flooded. |
| May 2001 | Thunderstorm Wind | Dayton | $100,000 | no account filed |
| June 2000 | Flood | Countywide | $100,000 | no account filed |
| May 2000 | Flash Flood | Countywide | $100,000 | no account filed |
| September 2000 | Flash Flood | Monroe | $100,000 | no account filed |
| July 2008 | Thunderstorm Wind | Juda | $75,000 | Powerful thunderstorm winds toppled large trees and knocked down tree branches that damaged several homes in and around Juda. |
| April 2004 | Thunderstorm Wind | Monroe | $75,000 | no account filed |
| May 2000 | Thunderstorm Wind | Monroe | $75,000 | no account filed |
| June 2013 | Flash Flood | New Glarus | $60,000 | Law enforcement officials called in with many reports of flooded roads due to the heavy rainfall. Roads on the west side of New Glarus were washed out. |
| February 2018 | Flood | Postville | $50,000 | Widespread flooding of lowland and agricultural land countywide, including numerous road closures. Some damage to roads with repairs necessary. Some basement flooding. Water several inches deep in portions of Monticello. The entire Sugar River State bike trail was closed due to flooding and erosion. The greatest flooding in the county was near the Sugar and Pecatonica Rivers. A State of Emergency was declared for the county. |
| June 2014 | Tornado (EF1) | Postville | $50,000 | Tornado damage to farmsteads along Hay Hollow Road. Significant damage to farm buildings. Numerous large trees down. Estimated wind speed up to 95 mph. |
| June 2008 | Thunderstorm Wind | Juda | $50,000 | Powerful thunderstorms winds knocked down large trees, and two sheds blown down. |
| July 1998 | Thunderstorm Wind | Monroe | $50,000 | no account filed |
| July 2013 | Thunderstorm Wind | New Glarus | $40,000 | Law enforcement officials reported trees and power lines blown down by thunderstorm wind gusts estimated up to 70 mph (61 knots) in a 6-mile wide swath between New Glarus and Monticello. New Glarus was completely without power for a time after the storms. |
| April 1997 | Thunderstorm Wind | Browntown | $35,000 | no account filed |
| May 2013 | Thunderstorm Wind | Browntown | $30,000 | Law enforcement officials reported trees and power lines blown down by thunderstorm wind gusts estimated at 65 mph (56 knots) along a 15 mile-wide path from 5 miles south-southeast of Browntown to Dayton. |
| May 2012 | Thunderstorm Wind | New Glarus | $30,000 | A trained spotter reported trees and power lines downed by powerful thunderstorm wind gusts estimated at 80 mph (74 knots) in the town of New Glarus. One car was totally damaged when struck by a falling tree, with roof shingles blown off several homes. |
| May 2012 | Thunderstorm Wind | Dayton | $30,000 | A trained spotter reported trees and power lines downed by powerful thunderstorm wind gusts estimated at 80 mph (74 knots) in a swath from from 2 miles north of Dayton to Dayton. Roof shingles were blown off several homes. |
| June 1996 | Flash Flood | Monroe | $30,000 | no account filed |
| March 2019 | Flood | Jordan | $25,000 | The entire Sugar River was flooding from just south of Belleville, downstream to the Avon Township of Rock Co. The Sugar River at Albany reached moderate flood stage, and at Brodhead reached major flood stage. Various roads were closed near the river in the Attica, Albany, and Brodhead areas. These included portions of highway X, Schneeberger Rd., Tin Can Rd., and highway T near the Avon Township of Rock Co. A water rescue occurred on Schneeberger Rd. In Albany, portions of South Water St. floods from a backup storm sewer. Floodwaters affect the basements of some homes along South Water St. and in the basements of a few businesses on North Water St. Floodwaters affect the back yards of some homes along South Mill St. and South Water St. Floodwaters are into Village Park. Farther to the west in the Townships of Jordan and Monroe, lowland and creek flooding resulted in the closure of highway Y from highway 81 to M. Klondike Rd. is flooded and closed in the Town of Jordan. |
| June 2014 | Thunderstorm Wind | Monroe | $25,000 | Dozens of large 50 year old trees uprooted, snapped, and downed. Power lines down as well. |
| April 2007 | Lightning | Monroe | $25,000 | Dozens of power outages resulted from lightning stikes from the city of Monroe to Brodhead. Either the lines and poles were hit or the transformers were hit. |
| May 2004 | Thunderstorm Wind | New Glarus | $25,000 | no account filed |
| August 2002 | Thunderstorm Wind | Monroe | $25,000 | no account filed |
| July 1999 | Thunderstorm Wind | Dayton | $25,000 | no account filed |
| June 1992 | Tornado (F1) | not stated | $25,000 | no account filed |
| July 1967 | Tornado (F1) | not stated | $25,000 | no account filed |
| October 2019 | Flood | Browntown | $20,000 | The Pecatonica River at Martintown reached moderate flood stage, cresting at 18.83 feet the early morning of October 7th. This is a continuation of flooding that began on September 15th. Some homes in the Martintown area have floodwaters in their basements and first floors. Martintown Road and West River Road are flooded. Upstream in Browntown, Highway MM and West Indies Road are flooded. |
| June 2015 | Thunderstorm Wind | Postville | $20,000 | Two homes with greater than 20 percent of the roof damaged or removed. Numerous large trees snapped or uprooted. A very large uprooted tree clipped the corner of a house damaging the roof, and also fell on a truck. |
| June 2015 | Thunderstorm Wind | Postville | $20,000 | Numerous large trees snapped and uprooted. A 15 foot trailer was rolled into the side of a garage, damaging a portion of the wall. |
| July 2011 | Thunderstorm Wind | Jordan | $20,000 | The Green County Emergency Manager reported trees down; power lines down and 1 home damaged in a 20-mile wide swath from near Jordan Center to north of Brodhead due to damaging thunderstorm wind gusts estimated at 65 knots (75 mph). Corn crops, valued at $2.2 million, were also flattened. Ludlow Bar in Monroe lost part of their roof. Wind gusts of 62 mph (54 knots) were measured by the AWOS at Mineral Point Airport at 656 am CDT and by a trained spotter in Brodhead at 658 am CDT. |
| July 2008 | Thunderstorm Wind | Monroe | $20,000 | Powerful thunderstorm winds toppled large trees, and knocked down tree branches that brought down power-lines. |