| June 2021 | Hail | Williston | $1,000,000 | This was the first of multiple rounds of hail to strike the Williston area the evening of June 10. With this round, hail up to the size of tennis balls fell over the Williston area. This caused damage to many roofs and vehicles, including damaging every police car in the city, and every vehicle parked in the Williams County facility lot. In addition, strong winds with this storm blew a roof off a truck and car wash. |
| September 2014 | Thunderstorm Wind | Williston | $1,000,000 | Analysis of damage photos indicated that the peak wind was around 80 mph. The Williston Airport ASOS measured 71 mph at 8:33 PM CDT, but the worst damage was in other parts of Williston. Large trees were snapped and uprooted, fences were destroyed, and vehicles were destroyed by falling trees. It was estimated that the high winds lasted for about 10 minutes. Half dollar sized hail was also reported at this time. |
| July 2022 | Hail | Williston | $500,000 | Large hail fell over the Williston area causing damage to roofs, siding, and vehicles. |
| August 1993 | Hail | Williston | $500,000 | Between 3.00 and 7.00 inches of rain fell over a large part of Williams, Divide, Burke, and Mountrail Counties overnight August 21st and 22nd. Water damage from the heavy rains was widespread. A section of Highway 1804 was completely washed out. The downpour swept a motor home off the highway near Lewis and Clark State Park. Fortunately, the occupants escaped injury. |
| June 2021 | Hail | Williston | $200,000 | This is the second in a series of storms to strike the Williston area. Ping pong size hail accompanied this storm, along with very heavy rainfall. Additional damage was done to roofs and vehicles. |
| June 2016 | Thunderstorm Wind | Williston | $100,000 | Estimated 75 mph thunderstorm wind gusts occurred at the Williams County Fairgrounds. The Williams County Fair was ongoing at the time, and almost all the large tents set up were blown over. No injuries or fatalities occurred. |
| August 2011 | Thunderstorm Wind | Williston | $45,000 | Tree branches were broken off at the Williston airport and a new hanger was damaged. |
| August 2010 | Hail | Williston | $40,000 | Windows were broken on the north side of a home, and car windshields were broken out. |
| July 1999 | Thunderstorm Wind | Williston | $40,000 | no account filed |
| August 2010 | Hail | Williston | $35,000 | Damage was sustained to vehicles and siding on a home. |
| August 2010 | Hail | Williston | $35,000 | no account filed |
| July 2020 | Thunderstorm Wind | Williston | $30,000 | Damage included a quonset door caving in, shingles and soffit being ripped off a building, and tree damage. |
| July 2010 | Lightning | Williston | $25,000 | Lightning struck a mobile home in Williston, resulting in a fire to the residence. Nobody was injured in the fire. |
| July 2017 | Thunderstorm Wind | Williston | $15,000 | Elm trees in a park were knocked over by the thunderstorm wind gusts. Minor damage occurred to a tin roof on a structure where some panels lifted off. |
| August 2010 | Hail | Williston | $12,000 | A camper and truck were dented. |
| July 2009 | Thunderstorm Wind | Williston | $10,000 | A severe thunderstorm wind gust resulted in the destruction of a storage pole barn. |
| August 1997 | Thunderstorm Wind | Williston | $5,000 | thunderstorm winds caused a tree to fall across a pickup |
| June 2007 | Thunderstorm Wind | Williston | $4,000 | Several small tree branches broken. Newspaper article showed one larger branch snapped off at the tree trunk and landed on a camper trailer parked under the tree. The roof of the camper was dented. Accompanied by penny size hail. |
| June 2021 | Tornado (EFU) | Williston | - | The tornado touched down in an open field east of Williston. There was no damage to evaluate and so by National Weather Service policy the tornado is rated EF Unknown. |
| September 2014 | Hail | Williston | - | The hail was accompanied by severe thunderstorm winds around 80 mph. Damage estimates are noted in the thunderstorm wind storm data entry from 8:30 to 8:40 PM CDT. Half-dollar and quarter sized hail were also reported at the same time in Williston by a co-op observer and by law enforcement respectively. |
| June 2013 | Thunderstorm Wind | Williston | - | Delete. |
| August 2013 | Thunderstorm Wind | Williston | - | Very heavy rain accompanied the strong winds. |
| July 2013 | Funnel Cloud | Williston | - | A brief funnel cloud was observed. |
| June 2012 | Thunderstorm Wind | Williston | - | A report of severe thunderstorm winds was received. |
| June 2012 | Thunderstorm Wind | Williston | - | Over one inch of rain accompanied the thunderstorm. |
| July 2010 | Thunderstorm Wind | Williston | - | Strong winds were reported in the city of Williston, resulting in power bumps and displaced trash dumpsters. |
| May 2008 | Hail | Williston | - | Hail was reported near the intersection of highways 2 and 85. |
| June 2007 | Hail | Williston | - | Storm was accompanied by high wind. No hail damage was reported. |
| June 2005 | Thunderstorm Wind | Williston | - | Wind speed 58 mph or higher for duration of event. Peak of 69 mph at 233 AM CST and 234 AM CST. Numerous large trees down from Williston to Trenton area. Wind ASOS measured. |
| July 2005 | Hail | Williston | - | Reported at Lewis and Clark State Park. |
| July 2003 | Hail | Williston | - | Winds estimated at 55 mph flipped a couple campers over on their sides and a picnic shelter was blown over at Blacktail Dam Recreational area. |
| July 2001 | Tornado (F0) | Williston | - | Briefly touched down in open country. |
| August 2000 | Lightning | Williston | - | Lightning started a fire which burned 20 acres near a golf course. |
| July 1999 | Hail | Williston | - | Broken windows in moble homes. |
| July 1999 | Thunderstorm Wind | Williston | - | Numerous power poles and lines down. |
| July 1998 | Thunderstorm Wind | Williston | - | Twentyone trailers/cabins were damaged at the trailer park near the Black Tail dam. Roofs were torn off trailers, north side windows were broken, trees were knocked over, and trailers were moved off their foundations. |
| July 1998 | Hail | Williston | - | Hail combined with strong winds to increase damage. |
| June 2025 | Hail | Williston | - | no account filed |
| July 2025 | Hail | Williston | - | no account filed |
| July 2022 | Hail | Williston | - | no account filed |
| June 2022 | Hail | Williston | - | no account filed |
| June 2021 | Hail | Williston | - | no account filed |
| June 2021 | Hail | Williston | - | no account filed |
| July 2020 | Hail | Williston | - | no account filed |
| May 2018 | Funnel Cloud | Williston | - | no account filed |
| July 2018 | Hail | Williston | - | no account filed |
| July 2018 | Hail | Williston | - | no account filed |
| June 2018 | Hail | Williston | - | no account filed |
| June 2016 | Hail | Williston | - | no account filed |
| July 2016 | Funnel Cloud | Williston | - | no account filed |
| September 2014 | Funnel Cloud | Williston | - | no account filed |
| June 2013 | Thunderstorm Wind | Williston | - | no account filed |
| August 2013 | Hail | Williston | - | no account filed |
| June 2012 | Hail | Williston | - | no account filed |
| June 2012 | Hail | Williston | - | no account filed |
| June 2012 | Hail | Williston | - | no account filed |
| June 2012 | Hail | Williston | - | no account filed |
| June 2012 | Hail | Williston | - | no account filed |
| August 2010 | Hail | Williston | - | no account filed |
| July 2010 | Thunderstorm Wind | Williston | - | no account filed |