NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Riverton, WY
Every tropical system within 75 miles since 1851 and every tornado within 25 miles since 1950.
Data: NOAA NHC HURDAT2 and NOAA SPC tornado and hail reports, through 2025 · Updated
No tropical storm or hurricane has passed within 75 miles of Riverton, Wyoming since records began in 1851. Since 1950, 15 tornadoes have touched down within 25 miles, 1 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 15
- EF3 or stronger
- 1
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
no recorded deaths
What the records show for Riverton
The strongest of the 15 tornadoes within 25 miles was an F3 on June 16, 1962; its path came within 20 miles. Of the 15, 3 had paths within 5 miles of the city centre, and 4 have come since 2000. June has had the most tornadoes, 7. The most recent tornado was on August 11, 2020. Riverton has more tornadoes within 25 miles than 57% of the 35 Wyoming cities on this site. Hail has been reported within 10 miles 33 times since 1973, with stones up to 1.75 inches (golf ball size). Riverton has more hail reports within 10 miles than 68% of the 35 Wyoming cities.
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Tornadoes within 25 miles of Riverton
By decade
- 2020s1
- 2010s2
- 2000s1
- 1990s1
- 1980s3
- 1970s1
- 1960s6(1 EF3+)
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Jun 16, 1962 | F3 | 20 mi | 0.5 mi | 0 / 0 |
| Jun 7, 1986 | F2 | 18 mi | 2 mi | 0 / 0 |
| Jun 6, 1967 | F2 | 6 mi | 8.2 mi | 0 / 2 |
| May 6, 2014 | EF1 | 20 mi | 1.52 mi | 0 / 0 |
| Jun 6, 1997 | F1 | 1 mi | 2 mi | 0 / 0 |
| Aug 3, 1980 | F1 | 19 mi | 0.1 mi | 0 / 0 |
| Aug 3, 1976 | F1 | 25 mi | 0.1 mi | 0 / 0 |
| Jun 6, 1968 | F1 | 8 mi | 3 mi | 0 / 0 |
| Jun 5, 1968 | F1 | 4 mi | 0.1 mi | 0 / 0 |
| Jun 14, 1967 | F1 | 5 mi | 0.5 mi | 0 / 1 |
| Apr 23, 1964 | F1 | 22 mi | 0.5 mi | 0 / 0 |
| Aug 11, 2020 | EF0 | 12 mi | 0.19 mi | 0 / 0 |
The strongest 12 of 15, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Riverton
The Storm Prediction Center has 33 hail reports within 10 miles of Riverton since 1973, made on 24 separate days. Of these, 18 were 1 inch across or larger, and none reached 2 inches. The largest size, 1.75 inches (golf ball size), was reported on 2 days, most recently June 23, 2023. The most recent report is from August 26, 2024. August has the most reports, 11.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Riverton
The nearest NOAA station with 1991–2020 climate normals is Riverton, WY, 2 miles northwest of Riverton at 4,955 feet. July is the warmest, with an average high of 88°F and low of 55°F; January is the coolest, at 29°F and 4°F. May is the wettest at 2.0 inches of precipitation on average and December the driest at 0.3 inches; the year adds up to 9.5 inches over 26 days with at least a tenth of an inch. Highs reach 90°F on about 38 days a year, almost all from June to September. Lows fall below freezing on about 193 nights a year. Snowfall averages 44.3 inches a year, most of it in February. That 9.5 inches is more than at 6 of the 32 Wyoming stations used on this site (19%). Lander, 24 miles southwest, has its own station (Lander 11 SSE, WY): 16.2 inches a year, 6.7 more than here, and a July average high of 86°F against 88°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" | Snow in |
|---|---|---|---|---|---|
| Jan | 29 | 4 | 0.4 | 1 | 5.5 |
| Feb | 36 | 10 | 0.4 | 2 | 7.4 |
| Mar | 49 | 22 | 0.7 | 2 | 6.5 |
| Apr | 58 | 31 | 1.3 | 4 | 7.2 |
| May | 67 | 40 | 2.0 | 5 | 2.1 |
| Jun | 79 | 49 | 1.1 | 3 | 0.0 |
| Jul | 88 | 55 | 0.7 | 2 | 0.0 |
| Aug | 86 | 52 | 0.5 | 2 | 0.0 |
| Sep | 74 | 43 | 0.8 | 2 | 0.6 |
| Oct | 59 | 30 | 0.9 | 2 | 4.4 |
| Nov | 43 | 17 | 0.4 | 1 | 5.3 |
| Dec | 30 | 6 | 0.3 | 1 | 5.3 |
| Year | 58 | 30 | 9.5 | 26 | 44.3 |
Averages for 1991–2020 at Riverton, WY (4,955 ft), from NOAA NCEI U.S. Climate Normals. Normals describe the station; the farther a place is from it, and the bigger the difference in height, the more its weather can differ.
Floods, thunderstorm wind and lightning near Riverton
Since 1996, the National Weather Service has logged 75 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Riverton: 56 thunderstorm wind reports, 16 floods, 2 flash floods and 1 lightning strike. They killed 1 person and injured 0, and the NWS estimated $4.1 million in property and crop damage. The strongest thunderstorm gust on record here was 86 mph, on May 22, 2006.
February 21, 2017: flood 3 miles from the centre of Riverton — 1 killed, $10,000 damage.
NWS: “Law enforcement reported flooding ditches and sheet flooding north of Riverton on the evening of February 21st. A 33-year old man fell into the flood waters and drowned.”
June 4, 2017: flood 9 miles from the centre of Riverton — $2.0 million damage.
NWS: “Abnormally large snowpack melted across the mountains of western and central Wyoming and caused the Wind River to Flood. At the Gauge at Riverton, the river crested above 12 feet, a new record.”
June 24, 2011: flood in Riverton — $665,000 damage.
NWS: “Melting snow caused the Wind River at Dubois to reach flood stage early on the morning of Friday, June 24. The flood waters surrounded sandbagged homes, inundating yards and a local campground.”
Source: NOAA NCEI Storm Events Database, events whose starting point is on record, 1996 to June 30, 2026. Damage is the NWS estimate in the dollars of the year, not insured losses, and NWS notes that some reports are unverified.
Flood insurance claims, disaster declarations and FEMA risk ratings
Fremont County, which includes Riverton, has been named in 6 federal disaster or emergency declarations since 2010, 4 of them major disasters (by incident: 2 biological emergencies, 2 floods, 1 fire, 1 severe storm). The latest major disaster declaration was Covid-19 Pandemic, on April 11, 2020. FEMA's National Risk Index gives Fremont County a Relatively Low rating for natural hazard risk overall; by hazard: Relatively High for lightning; Relatively Low for hail, inland flooding and strong wind; Very Low for tornadoes and heat waves. It models the county's expected loss from all 18 hazards it covers at $18.6 million a year, the 7th highest of 23 Wyoming counties; of the hazards above, the largest share, $10.0 million (54%), is from inland flooding.
Claims: FEMA, OpenFEMA Dataset FIMA NFIP Redacted Claims – v3, summed over ZIP codes; payments in the dollars of each year, not adjusted for inflation. Declarations: Disaster Declarations Summaries – v2, by county. Retrieved October 25, 2026. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Risk ratings: FEMA, National Risk Index county table, December 2025 (v1.20), retrieved October 26, 2026; ratings compare counties nationwide, are meant for planning and are no substitute for a local risk assessment. This product uses the Federal Emergency Management Agency's National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
What counts as a pass, the distances and the sources: how this storm history is built.
Cities near Riverton
- Lander, WY24 mi
- Thermopolis, WY47 mi
- Worland, WY70 mi
- Pinedale, WY77 mi
- Rawlins, WY90 mi
- Big Piney, WY95 mi
- Casper, WY100 mi
- Greybull, WY104 mi
- Rock Springs, WY107 mi
- Evansville, WY112 mi
- Green River, WY114 mi
- Cody, WY116 mi
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