| June 2003 | Flash Flood | Buffalo | $60,000 | no account filed |
| July 2018 | Hail | Buffalo | $10,000 | A thunderstorm became severe and dropped large hail across central Johnson County, including along Interstate 25. A trained spotter 13 miles SSE of Buffalo reported golf ball sized hail and had two windows and a skylight broken by the hail. A farm along Trabing Road reported broken windows, truck mirrors and damaged siding on a house and barn. |
| June 2015 | Flash Flood | Buffalo | $10,000 | Strong thunderstorms produced heavy rain across eastern Johnson and western Campbell counties near Interstate 90. The heaviest rain, estimated at three inches, fed Dead Horse Creek, a small tributary of the Powder River. Dead Horse Creek overflowed and eventually inundated a stretch of Interstate 90 around mileposts 90 and 91, which resulted in the closure of the road from late Wednesday evening, June 3, until the morning of June 4. |
| July 2009 | Thunderstorm Wind | Buffalo | $10,000 | Johnson County Dispatch reported estimated wind gusts of 70 to 80 mph which downed numerous trees and power lines in Buffalo. |
| June 2015 | Hail | Buffalo | $4,000 | Golf ball sized hail was reported at a pair of rural ranches along Tipperary Road east of Buffalo. The hail caused body damage to some vehicles. |
| June 2019 | Tornado (EF1) | Buffalo | $2,000 | An EF1 tornado touched down in the Big Horn Mountains near Powder River Pass and traveled east. Please see event summary for details. |
| August 2006 | Flash Flood | Buffalo | $1,400 | no account filed |
| June 2015 | Hail | Buffalo | $1,000 | Golf ball sized hail fell at a ranch along Tipperary Road east of Buffalo. The hail broke one window at a home on the ranch. |
| April 2026 | Thunderstorm Wind | Buffalo | - | A 63 mph gust was recorded on the south side of Buffalo. A 59 mph wind gust occurred at the Johnson County airport. |
| July 2025 | Hail | Buffalo | - | The public reported ping pong ball sized hail along Interstate 25 to the south of Buffalo. |
| July 2023 | Hail | Buffalo | - | Half dollar to golf ball size hail fell in and around Buffalo. |
| June 2023 | Funnel Cloud | Buffalo | - | The public reported a funnel cloud to the east of Buffalo near TW Road. |
| June 2022 | Thunderstorm Wind | Buffalo | - | A maximum wind gust of 61 mph was reported at the Johnson County Airport near Buffalo, WY. In the city of Buffalo, the public reported small limbs snapped off trees and a few shingles blown off roofs. |
| May 2021 | Hail | Buffalo | - | The public reported penny size hail in eastern Johnson County, Wyoming. |
| July 2021 | Hail | Buffalo | - | Trained spotters reported quarter-sized hail across portions of northern Johnson County to the east of Buffalo. |
| May 2020 | Hail | Buffalo | - | A trained spotter reported nickel sized hail to the southeast of Buffalo, Wyoming. |
| May 2020 | Hail | Buffalo | - | A storm gathered strength as it moved in deeper moisture east of the Bighorn Mountains. And become severe near Buffalo, Wyoming. Hail from nickel to golf ball sized hail was reported. |
| July 2019 | Hail | Buffalo | - | A trained spotter reported half dollar sized hail, 21 miles northeast of Buffalo, Wyoming. |
| July 2019 | Hail | Buffalo | - | A trained spotter reported penny sized hail in Buffalo, Wyoming. |
| July 2019 | Hail | Buffalo | - | The public reported quarter sized hail near Barnum, Wyoming. |
| August 2019 | Hail | Buffalo | - | The public reported quarter size hail 28 miles east of Buffalo, Wyoming. |
| July 2018 | Thunderstorm Wind | Buffalo | - | A 60 mph wind gust was recorded 7 miles NE of Buffalo. |
| July 2018 | Hail | Buffalo | - | A thunderstorm developed over the Bighorn Mountains and became severe as it moved south-southeast across Johnson County. There were multiple reports of quarter to golf ball size hail along the path by spotters and on social media. |
| July 2018 | Hail | Buffalo | - | Hail fell along the path of a long lived thunderstorms as it traveled southeastward through Johnson County. The largest hail recorded was 1 inch around Linch. |
| July 2018 | Hail | Buffalo | - | The public reported nickel size hail along Interstate 90 to the east of Buffalo. |
| July 2018 | Thunderstorm Wind | Buffalo | - | A wind gust of 58 mph was recorded along Interstate 90 east-southeast of Buffalo. |
| June 2018 | Hail | Buffalo | - | The public reported penny size hail along Interstate 90 to the southeast of Buffalo. |
| June 2018 | Hail | Buffalo | - | A trained spotter reported nickel size hail 6 miles WNW of Buffalo. |
| June 2018 | Hail | Buffalo | - | Hail ranging from nickel to half dollar size fell to the southeast of Buffalo. |
| June 2017 | Funnel Cloud | Buffalo | - | An off-duty NWS meteorologist reported a funnel cloud near the Trabing Road interchange of Interstate 25. |
| June 2017 | Flash Flood | Buffalo | - | A CocoRaHS reporter reported flash flooding along Crazy Woman Creek near the south end of Espinoza Road south of Interstate 90. |
| August 2017 | Thunderstorm Wind | Buffalo | - | A trained spotter measured a wind gust of 62 mph around 6 miles west-northwest of Buffalo. |
| May 2016 | Hail | Buffalo | - | The public reported golf ball sized hail in rural eastern Johnson County north of Interstate 90. |
| May 2016 | Hail | Buffalo | - | Large hail was reported along the Upper Powder River Road in northeast Johnson County. A picture posted on Facebook showed a bucket of hail with some stones up to the size of tennis balls. |
| July 2016 | Hail | Buffalo | - | Hail ranging in size from nickels to 1.25 inches in diameter was reported in Buffalo. |
| July 2016 | Hail | Buffalo | - | One inch diameter hail fell at a rural residence east of Buffalo. |
| July 2016 | Thunderstorm Wind | Buffalo | - | Wind gusts of 65 and 68 mph were measured along Interstate 90 east of Buffalo as a thunderstorm moved north across the road. |
| May 2015 | Flood | Buffalo | - | Heavy rainfall of two to three inches fell across northern Johnson County and caused flooding along Clear Creek. The flooding was mainly over low lying fields and caused little to no damage. |
| June 2015 | Hail | Buffalo | - | One inch diameter hail fell at a ranch in rural Johnson County north of Interstate 90. The hail was part of an at least 10 mile swath of large hail that moved east across the county. |
| June 2015 | Hail | Buffalo | - | One in a series of strong thunderstorms dropped penny sized hail near Buffalo. |
| June 2014 | Thunderstorm Wind | Buffalo | - | A 67 mph wind gust was measured by a mesonet sensor near Indian Creek Road on Interstate 90. |
| May 2014 | Flash Flood | Buffalo | - | Heavy thunderstorm rains of four to six inches fell to the east over Campbell County and along the Johnson-Campbell County line filling the Dead Horse Creek drainage with heavy run-off. The resultant high water caused flash flooding of Dead Horse Creek near milepost 90 on Interstate 90 in eastern Johnson County. The flooding caused the shutdown of the interstate between Buffalo and Gillette for about four hours between 2100 MST on Saturday, May 24, and 0100MST on Sunday, May 25. |
| June 2014 | Hail | Buffalo | - | A prolonged period of penny to nickel sized hail fell along Interstate 90 near the Powder River. The hail covered the interstate to a depth of five to six inches and reduced traffic to a single lane in some spots. The combination of rain and hail caused minor flooding on Dry Creek along the Powder River Road about three miles north of the interstate. |
| May 2013 | Hail | Buffalo | - | The public reported ping pong ball sized hail at the Powder River Rest Stop off of Interstate 90. |
| July 2011 | Hail | Buffalo | - | One inch diameter hail was observed at a ranch in far northeast Johnson County. |
| June 2010 | Flood | Buffalo | - | Melting snow in the Bighorn Mountains above Buffalo raised water levels on Clear Creek in Buffalo. The snow melted during the previous afternoon and then moved down the river channel during the nighttime hours. Clear Creek crested about 0.2 of a foot above flood stage of 6.0 feet. Only minor impacts occurred in low lying areas near the river. |
| June 2010 | Tornado (EF0) | Buffalo | - | A motorist on Interstate 90 at milepost 102 in Campbell County shot video of a landspout tornado estimated to be five miles west in far eastern Johnson County. No damage or injuries were reported. The landspout did not occur in conjunction with a thunderstorm. |
| August 2010 | Hail | Buffalo | - | The public reported nickel sized hail two miles east of Buffalo. |
| August 2010 | Funnel Cloud | Buffalo | - | A narrow funnel cloud was seen two miles east of Buffalo. |
| July 2009 | Hail | Buffalo | - | Dime to nickel sized hail fell southeast of Buffalo. A peak wind of 54 mph and 1.20 inches of rain also occurred. |
| August 2009 | Hail | Buffalo | - | The Powder River Rest Area along Interstate 90 was bombarded with hail of nickel to golf ball size. |
| July 2008 | Hail | Buffalo | - | Penny sized hail fell near exit 88 on Interstate 90. |
| June 2008 | Hail | Buffalo | - | Nickel sized hail was reported along Interstate 25 about three miles south of Buffalo. |
| May 2008 | Tornado (EF0) | Buffalo | - | A trucker reported a tornado near Interstate 90 east of mile marker 76. |
| July 2007 | Hail | Buffalo | - | Public report of nickel sized hail along U.S. Highway 16. |
| July 2007 | Hail | Buffalo | - | Nickel sized hail reported by the public. |
| July 2007 | Hail | Buffalo | - | One inch hail reported by the public along U.S. Highway 16. |
| July 2007 | Funnel Cloud | Buffalo | - | The Johnson County Sheriff's Office reported a funnel cloud near Interstate 90 between Buffalo and Lake DeSmet. |
| May 1994 | Thunderstorm Wind | Buffalo | - | A wind gust of 59 knots (68 mph) was measured in Buffalo. |
| July 1994 | Hail | Buffalo | - | A storm over eastern Johnson County produced dime-size hail. |