NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Roundup, MT
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 Roundup, Montana since records began in 1851. Since 1950, 4 tornadoes have touched down within 25 miles, 0 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 4
- EF3 or stronger
- 0
within 75 mi, since 1851
below hurricane strength
within 25 mi, since 1950
no recorded deaths
What the records show for Roundup
The highest rating among the 4 tornadoes within 25 miles is F0, reached 4 times; the most recent, on August 26, 2004, came within 18 miles. Of the 73 Montana cities on this site, 42% have more tornadoes within 25 miles than Roundup. Hail has been reported within 10 miles 85 times since 1955, with stones up to 3 inches (tea cup size). Roundup has more hail reports within 10 miles than 90% of the 73 Montana cities.
Compare Roundup's storm record with another city →
Tornadoes within 25 miles of Roundup
By decade
- 2000s1
- 1990s3
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Aug 26, 2004 | F0 | 18 mi | — | 0 / 0 |
| May 20, 1999 | F0 | 6 mi | 0.2 mi | 0 / 0 |
| Jul 14, 1993 | F0 | 23 mi | 0.1 mi | 0 / 0 |
| Jul 10, 1992 | F0 | 16 mi | 0.1 mi | 0 / 0 |
The strongest 4 of 4, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Roundup
The Storm Prediction Center has 85 hail reports within 10 miles of Roundup since 1955, made on 45 separate days. Of these, 57 were 1 inch across or larger, and 5 reached 2 inches. The largest, 3 inches (tea cup size), fell on July 4, 2013. The most recent report is from July 28, 2025. July has the most reports, 41.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Roundup
The nearest NOAA station with 1991–2020 climate normals is Roundup, MT, 7 miles south of Roundup at 3,200 feet. July is the warmest, with an average high of 89°F and low of 54°F; January is the coolest, at 37°F and 13°F. Highs reach 90°F on about 44 days a year, almost all from June to September. Lows fall below freezing on about 163 nights a year. Snowfall averages 24.4 inches a year, most of it in December. That 14.9 inches is more than at 31 of the 58 Montana stations used on this site (53%). Shepherd, 38 miles south, has its own station (Huntley Exp Stn, MT): 14.7 inches a year, 0.2 less than here, and a July average high of 87°F against 89°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" | Snow in |
|---|---|---|---|---|---|
| Jan | 37 | 13 | 0.4 | 2 | 5.2 |
| Feb | 41 | 15 | 0.4 | 1 | 3.9 |
| Mar | 51 | 22 | 0.7 | 2 | 4.4 |
| Apr | 60 | 30 | 1.7 | 4 | 1.4 |
| May | 69 | 39 | 2.6 | 6 | 0.1 |
| Jun | 78 | 48 | 2.9 | 7 | 0.0 |
| Jul | 89 | 54 | 1.7 | 4 | 0.0 |
| Aug | 88 | 51 | 1.2 | 3 | 0.0 |
| Sep | 77 | 42 | 1.2 | 3 | 0.0 |
| Oct | 61 | 32 | 1.2 | 3 | 1.0 |
| Nov | 47 | 22 | 0.5 | 2 | 2.8 |
| Dec | 37 | 14 | 0.4 | 2 | 5.6 |
| Year | 61 | 32 | 14.9 | 39 | 24.4 |
Averages for 1991–2020 at Roundup, MT (3,200 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 Roundup
Since 1996, the National Weather Service has logged 18 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Roundup: 11 thunderstorm wind reports, 4 flash floods, 2 floods and 1 heavy rain event. None is recorded as killing or injuring anyone; the NWS estimated $10,000 in property and crop damage. The strongest thunderstorm gust on record here was 71 mph, on June 19, 2013.
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
Flood insurance policyholders in Roundup's ZIP code 59072 have filed 60 claims with the National Flood Insurance Program since 1978, and were paid $1.2 million for buildings and contents, in the dollars of each year. The year with the most claims was 2011, with 28. Of the 26 Montana cities on this site with 10 or more claims, 19 have fewer than Roundup.
Musselshell County, which includes Roundup, has been named in 15 federal disaster or emergency declarations since 1977, 9 of them major disasters (by incident: 4 fires, 4 floods, 3 severe storms, 2 biological emergencies). The latest major disaster declaration was Flooding, on October 11, 2023. FEMA's National Risk Index gives Musselshell County a Very Low rating for natural hazard risk overall; by hazard: Relatively Moderate for lightning; Relatively Low for hail; Very Low for tornadoes, inland flooding, strong wind and heat waves. It models the county's expected loss from all 18 hazards it covers at $4.9 million a year, the 38th highest of 56 Montana counties; of the hazards above, the largest share, $1.4 million (29%), 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 Roundup
- Shepherd, MT38 mi
- Huntley, MT48 mi
- Billings, MT52 mi
- Lewistown, MT57 mi
- Laurel, MT61 mi
- Park City, MT66 mi
- Hardin, MT68 mi
- Columbus, MT74 mi
- Joliet, MT74 mi
- Big Timber, MT80 mi
- Crow Agency, MT85 mi
- Forsyth, MT94 mi
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