NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Darby, 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 Darby, Montana since records began in 1851. Since 1950, 1 tornado has touched down within 25 miles, 0 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 1
- 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 Darby
The only tornado within 25 miles was an F2 on June 23, 1975; its path came within 24 miles. Of the 73 Montana cities on this site, 89% have more tornadoes within 25 miles than Darby. Hail has been reported within 10 miles 10 times since 2002, with stones up to 1.75 inches (golf ball size). Of the 73 Montana cities, 84% have more hail reports within 10 miles than Darby.
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Tornadoes within 25 miles of Darby
By decade
- 1970s1
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Jun 23, 1975 | F2 | 24 mi | 0.1 mi | 0 / 1 |
The strongest 1 of 1, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Darby
The Storm Prediction Center has 10 hail reports within 10 miles of Darby since 2002, made on 9 separate days. Of these, 7 were 1 inch across or larger, and none reached 2 inches. The largest, 1.75 inches (golf ball size), fell on July 6, 2009. The most recent report is from July 9, 2022. July has the most reports, 5.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Darby
The nearest NOAA station with 1991–2020 climate normals is Darby, MT, 13 miles north of Darby at 3,880 feet. July is the warmest, with an average high of 82°F and low of 50°F; December is the coolest, at 32°F and 19°F. Highs reach 90°F on about 22 days a year, almost all from June to September. Lows fall below freezing on about 167 nights a year. That 15.2 inches is more than at 36 of the 58 Montana stations used on this site (62%). Hamilton, 26 miles north, has its own station (Hamilton, MT): 13.7 inches a year, 1.5 less than here, and a July average high of 84°F against 82°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" |
|---|---|---|---|---|
| Jan | 34 | 19 | 1.1 | 4 |
| Feb | 38 | 21 | 0.9 | 3 |
| Mar | 47 | 27 | 0.9 | 3 |
| Apr | 54 | 31 | 1.0 | 4 |
| May | 64 | 39 | 1.6 | 5 |
| Jun | 72 | 45 | 2.1 | 6 |
| Jul | 82 | 50 | 1.1 | 3 |
| Aug | 81 | 48 | 0.9 | 3 |
| Sep | 71 | 42 | 1.2 | 3 |
| Oct | 57 | 33 | 1.5 | 5 |
| Nov | 42 | 25 | 1.6 | 4 |
| Dec | 32 | 19 | 1.3 | 4 |
| Year | 56 | 33 | 15.2 | 46 |
Averages for 1991–2020 at Darby, MT (3,880 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.
Flood insurance claims, disaster declarations and FEMA risk ratings
Ravalli County, which includes Darby, has been named in 13 federal disaster or emergency declarations since 1996, 7 of them major disasters (by incident: 5 fires, 3 severe storms, 2 biological emergencies, 1 flood). The latest major disaster declaration was Severe Winter Storm and Straight-Line Winds, on April 7, 2026. FEMA's National Risk Index gives Ravalli County a Relatively Low rating for natural hazard risk overall; by hazard: Relatively Moderate for lightning; Relatively Low for inland flooding and heat waves; Very Low for tornadoes, hail and strong wind. It models the county's expected loss from all 18 hazards it covers at $37.0 million a year, the 6th highest of 56 Montana counties; of the hazards above, the largest share, $6.6 million (18%), 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 Darby
- Hamilton, MT26 mi
- Corvallis, MT34 mi
- Victor, MT39 mi
- Stevensville, MT49 mi
- Salmon, ID53 mi
- Florence, MT56 mi
- Anaconda, MT62 mi
- Lolo, MT64 mi
- Missoula, MT72 mi
- Kooskia, ID76 mi
- Bonner, MT78 mi
- Deer Lodge, MT80 mi
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