| June 1984 | Tornado (F5) | not stated | 9 killed, 200 hurt, $250,000 | no account filed |
| April 1954 | Tornado (F2) | not stated | 4 hurt, $25,000 | no account filed |
| May 1965 | Tornado (F2) | not stated | 1 hurt, $25,000 | no account filed |
| September 1963 | Tornado (F2) | not stated | 1 hurt | no account filed |
| April 2006 | Hail | Ridgeway | $4,440,000 | no account filed |
| April 2006 | Hail | Rewey | $4,440,000 | no account filed |
| April 2006 | Hail | Rewey | $4,440,000 | no account filed |
| April 2006 | Hail | Mineral Pt | $4,440,000 | no account filed |
| April 2006 | Hail | Dodgeville | $4,440,000 | no account filed |
| June 2014 | Tornado (EF2) | Montfort Jct | $3,500,000 | A long track swath of sporadic to continuous tornado damage. Hundreds of trees uprooted, snapped, and damaged. Dozens of farm buildings damaged or destroyed, including many silos down. 59 homes damaged with 4 destroyed. Intermittent damaging downburst winds were likely adjacent to the tornado path. An area of corn leveled. |
| June 1998 | Thunderstorm Wind | Helena | $950,000 | no account filed |
| June 2000 | Flash Flood | North Portion | $583,000 | no account filed |
| May 2000 | Hail | Linden | $500,000 | no account filed |
| July 1994 | Thunderstorm Wind | Mineral Pt | $500,000 | no account filed |
| June 2014 | Tornado (EF2) | Edmund | $400,000 | A sporadic path of EF-2 tornado damage. Up to six power poles snapped. A large camper-trailer destroyed and tossed 100 yards. A well-built metal building significantly damaged, with debris landing on cars. Other smaller sheds destroyed. |
| July 2017 | Heavy Rain | Avoca | $360,000 | Washouts of mainly gravel roads and driveways in the northwest portion of the county. About 50 homes with mostly minor water damage. However, the north foundation of a home collapsed while the east and west foundations buckled due to water pressure. Water was briefly over a bridge on Sunny Road at the Dodge Branch of the Pecatonica River. The flooding also led to the loss of crops. |
| March 2023 | Tornado (EF1) | Rewey | $300,000 | Damage was mainly to a barn lean-to which was distributed through a field behind the facility. Another barn had roofing damage going in the opposite direction on the same grounds. |
| March 2023 | Tornado (EF1) | Rewey | $300,000 | Tornado damaged a wood supply store outbuilding. Frame was toe-nailed into the baseboards, so lowered the estimated wind speeds based upon this. Debris lofted into farm fields with a couple of other farm outbuildings damaged on this path. |
| May 2003 | Tornado (F1) | Mineral Pt | $300,000 | The same supercell that spun up a tornado near Belmont (Lafayette Co.), resulted in another tornado in Iowa County. The Iowa County tornado spun up at a location 4.5 miles east of Mineral Point, just southeast of the intersection of County DD and Ferrell Rd. It proceeded northeast to a location 2.7 miles north-northwest of Hollandale, or about 1 mile west of the intersection of Urness Rd and Long Valley Rd. Four barns or pole sheds sustained major damage, two homes had moderate damage, and considerable tree damage was noted. |
| July 1999 | Thunderstorm Wind | Blanchardville | $300,000 | no account filed |
| May 1985 | Tornado (F2) | not stated | $250,000 | no account filed |
| June 1984 | Tornado (F2) | not stated | $250,000 | no account filed |
| June 1973 | Tornado (F1) | not stated | $250,000 | no account filed |
| June 1973 | Tornado (F1) | not stated | $250,000 | no account filed |
| June 1969 | Tornado (F2) | not stated | $250,000 | no account filed |
| April 1956 | Tornado (F2) | not stated | $250,000 | no account filed |
| July 2007 | Thunderstorm Wind | Barneveld | $200,000 | Powerful downburst thundestorm winds gusting to around 65 knots (75 mph) toppled hundreds of large trees in a forested area. Several power-lines came down with tree debris. One large tree fell onto a vehicle. Two small sheds were destroyed by the winds, and one home sustained window damage. |
| August 2007 | Flash Flood | Avoca | $200,000 | Significant flash flooding affected the northern half of Iowa County, especially in the Avoca and Arena areas. Fast flowing water of 1 to 3 feet was reporte in those two communities and first responders built berms around Avoca. Water depths on STH 133 reached 2 to 4 feet. Sandbagging efforts in Avoca prevented major damage, however 4 homes in Avoca had water in basements. Ten roads in the Civil Town of Arena were closed. The basement of the County Sheriff buidling flooded out with a fair amount of water damage to contents. Several gravel shoulder washouts occurred and crops across the northern part of the county were damaged due to erosion. Overall, at least 20 homes sustained minor flood damage to basement contents. Additionally, a sump pump overflow occurred in the Iowa County Social Services Building in Dodgeville, resulting in minor water damage to basement contents. Rainfall amounts overnight, based on WSR-88D Doppler radar estimates, ranged from 3 to 4 inches over the southeast corner of the county to 8 to 9 inches along the Wisconsin river near Avoca. Unofficially there were reports of 10 inch amounts near Avoca. | |
| June 2000 | Flash Flood | North Portion | $200,000 | no account filed |
| May 1998 | Thunderstorm Wind | Countywide | $200,000 | no account filed |
| September 2011 | Thunderstorm Wind | Dodgeville | $100,000 | Law enforcement officials reported damage from severe thunderstorm wind gusts estimated at 70 knots (80 mph) in a 5-mile wide swath from southeast of Dodgeville to northeast of Hollandale. The damaging winds destroyed a cattle shed and caused minor damage to a barn. The winds damaged several corn fields on East Lawinger Road southeast of Dodgeville. A grain bin was knocked off its foundation and destroyed, and a corn field was flattened northeast of Hollandale. Numerous trees and power lines were knocked down by the powerful winds. |
| August 2007 | Thunderstorm Wind | Avoca | $100,000 | Powerful thunderstorm wind gusts to 65 knots (75 mph) toppled many trees and damaged several power-lines. |
| August 2007 | Flash Flood | Mineral Pt | $100,000 | Several rounds of thunderstorms with heavy rains on top of a saturated ground resulted in a flash flood event in hilly Mineral Point. Fast-flowing water quickly flooded the city' streets to a depth of 6 inches to 2 feet. One residential home's driveway was washed out by the flood waters. A few homes in the city sustained water damage to basement contents. Some soil erosion and crop damage were noted in the surrounding countryside.||August, 2007, rainfall totals include: 20.12 in Dodgeville, and an unofficial 25 at a location 2W of Barneveld. |
| May 2004 | Flash Flood | Highland | $100,000 | no account filed |
| June 2001 | Lightning | Mifflan | $100,000 | no account filed |
| June 2001 | Lightning | Mifflan | $100,000 | no account filed |
| July 1998 | Thunderstorm Wind | Livingston | $100,000 | no account filed |
| October 1996 | Lightning | Ridgeway | $100,000 | no account filed |
| July 2025 | Tornado (EF1) | Dodgeville | $85,000 | An EF-1 rated tornado developed near the Farm and Fleet in Dodgeville, first moving northeast through a corn field. The tornado then continued to the northeast, impacting numerous trees and one outbuilding. The strongest damage occurred off of County Road ZZ, where numerous large, healthy hardwood trees were uprooted. The tornado ended near Knobs Road, just west of County Road H. |
| July 2009 | Flash Flood | Avoca | $75,000 | Heavy rains from severe thunderstorms produced flash flooding that washed out the shoulders of several roads and driveways, causing $75,000 of damage. The AWOS unit at the Mineral Point Airport recorded 1.21 inches of rain between 1830 and 1900 CST. |
| April 2008 | Lightning | Dodgeville | $75,000 | LIghtning struck a communications tower belonging to the Iowa County Sheriff Department. Radios and computer equipment were damaged. The time of this event is estimated, since the newspaper article indicated that the event occurred during the morning hours. |
| May 2024 | Thunderstorm Wind | Hollandale | $70,000 | A swath of scattered tree damage including snapped trees. Multiple large and empty grain bins were heavily damaged at one location. One of the large poles associated with the grain bins fell onto a small car. At a different location a small portion of a roof was removed from a farm building. |
| August 2016 | Thunderstorm Wind | Linden | $70,000 | Eleven power poles snapped on highway 39 between Linden and county B. Numerous trees and branches down in the same area. |
| June 2013 | Flash Flood | Arena | $70,000 | Law enforcement officials reported many flooded roads, with some washed outacross Iowa County. State Highways 130 and 133 were closed by flooding and mudslides. |
| June 2017 | Thunderstorm Wind | Livingston | $60,000 | Several wooden electrical transmission lines were downed or snapped along highway 80 as a strong line of thunderstorms moved through the area. |
| June 2013 | Flash Flood | Mineral Pt | $60,000 | Law enforcement officials reported many flooded roads due to the heavy rainfall of 5 to 8 inches. A sinkhole was reported near Mineral Point. |
| May 2013 | Thunderstorm Wind | Avoca | $60,000 | Trained spotters reported several homes with roof damage and several outbuildings on farms damaged by powerful thunderstorm wind gusts that were estimated at 80 mph (70 knots). The damaging winds also downed many trees and power lines along the path that extended from 4 miles southwest of Avoca to Avoca. |
| August 2016 | Thunderstorm Wind | Hollandale | $50,000 | Trees and power lines down along highway 191 and Long Valley Road. Long Valley |Road was closed with approximately 30 trees down. |
| September 2011 | Thunderstorm Wind | Linden | $50,000 | The Iowa County Emergency manager reported damage from severe thunderstorm wind gusts estimated at 70 knots (80 mph) in a 5-mile wide swath from south of Linden to south-southwest of Dodgeville. The damaging winds blew the roof off of a cattle barn south of Dodgeville and knocked over a grain bin. Numerous trees and power lines were knocked down by the powerful winds. |
| June 2009 | Thunderstorm Wind | Dodgeville | $50,000 | Many reports of toppled trees and damaged power-lines were received from within and near Dodgeville to a couple miles east of Mineral Point. |
| August 2009 | Thunderstorm Wind | Blanchardville | $50,000 | A swath of thunderstorm wind damage occurred over southeast Iowa County. This swath extended into northeastern Lafayette County and east/southeast into the counties of Dane and Green. Overall the swath was about 15 miles wide. Numerous large trees were uprooted or large branches broken. Tree debris brought down some power-lines. Some roof shingles were blown off the roofs of a couple homes. |
| August 2007 | Thunderstorm Wind | Arena | $50,000 | Powerful thunderstorm wind gusts to 56 knots (65 mph) toppled many trees and damaged several power-lines. |
| August 2007 | Flash Flood | Arena | $50,000 | Overnight rainfalls of 5 to over 10 inches in the Arena to Barneveld to Hollendale vicinity resulted in a low-end flash flood. One significant mudslide occurred on CTH K about 2 miles northeast of Barneveld, and a second mudslide on CTH K about 2.5 miles south fo Barneveld. Soil erosion also occurred between Barneveld and about 4 miles northwest of Barneveld. CTH K was reduced to only 1-lane traffic where the two mudslides occurred (mud and trees), and large front-end loaders were needed to clear the road. Several homes had water in basements in and around Barneveld for the first time ever. A farmer 2 miles west of Barneveld measured at least 10 inches of rain (he had to empty a 5-inch raingage twice and missed some rain). A portion of Amacher Hollow Road in the rural portion of Area Township washed out when culverts filled up around Mill Creek. Water depths on that road reached 3 to 5 feet. Mill Creek also flowed over the bridge on Coon Rock Road near Demby Road. Additionally, most rivers and streams in the eastern third of Iowa County reached bankfull or flood stage for at least a few hours overight. The Wastewater Treatment Plant in Barneveld measured 9.75 inches. Other overnight rainfall amounts include 8.98 at a UW-Madison research site on the upper East Branch Pecatonica River about 2.4 miles south-southeast of Barneveld, 8.13 about 1 mile northeast of Ridgeway, 6.92 about 4 miles north of Hollendale, 6 in Hollendale, and 3.61 about 4 miles north of Dodgeville. |
| July 2006 | Thunderstorm Wind | Avoca | $50,000 | Trees and power lines reported down countywide. |
| June 1994 | Tornado (F1) | Patch Grove to | $50,000 | A tornado traveled easterly 5 miles across Grant county from 1 mile northeast of Patch Grove to 1 mile south of Mt. Hope. The tornado ripped a roof from a large hay barn, threw over a grain elevator, damaged several homes and leveled numerous trees and power lines. A severe thunderstorm dropped golfball hail and developed intense winds which downed power lines just west of Dodgeville (Iowa county). |
| July 2004 | Thunderstorm Wind | Cobb | $50,000 | no account filed |
| May 1999 | Flash Flood | Countywide | $50,000 | no account filed |
| October 2018 | Thunderstorm Wind | Cobb | $35,000 | A barn was pushed off its foundation with damage to the walls and the farm equipment inside the barn. Light-weight farm equipment was blown over. Some tree damage. |
| August 2018 | Flood | Arena | $30,000 | The record flooding of Black Earth Creek caused a rail bridge to fail on Wisconsin & Southern Railroad near Blynn Road east of Arena. Sections of railroad tracks were also washed out. The flooding of Blue Mounds Creek near Arena reached Village Edge Road and Helena Road on the north side of the village. Sandbagging and pumping was employed to protect homes. Highway 14 was inundated and closed by flood waters just west of County Road K due to record flooding of Black Earth and Blue Mounds Creeks. |
| June 2017 | Thunderstorm Wind | Cobb | $30,000 | Several electrical transmission lines were downed as a strong line of thunderstorms moved through the area. |