NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Bonner, 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 Bonner, Montana since records began in 1851. Since 1950, 2 tornadoes have touched down within 25 miles, 0 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 2
- 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 Bonner
The highest rating among the 2 tornadoes within 25 miles is F0, reached 2 times; the most recent, on March 3, 1991, came within 24 miles. Of the 73 Montana cities on this site, 73% have more tornadoes within 25 miles than Bonner. Hail has been reported within 10 miles 9 times since 1982, with stones up to 2.5 inches (tennis ball size). Of the 73 Montana cities, 86% have more hail reports within 10 miles than Bonner.
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Tornadoes within 25 miles of Bonner
By decade
- 1990s1
- 1980s1
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Mar 3, 1991 | F0 | 24 mi | 0.1 mi | 0 / 0 |
| Jul 20, 1983 | F0 | 22 mi | 2 mi | 0 / 0 |
The strongest 2 of 2, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Bonner
The Storm Prediction Center has 9 hail reports within 10 miles of Bonner since 1982, made on 8 separate days. Of these, 8 were 1 inch across or larger, and one reached 2 inches. The largest, 2.5 inches (tennis ball size), fell on June 29, 1982. The most recent report is from July 9, 2022.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Bonner
The nearest NOAA station with 1991–2020 climate normals is Potomac, MT, 4 miles southeast of Bonner at 3,690 feet. July is the warmest, with an average high of 82°F and low of 41°F; December is the coolest, at 29°F and 9°F. June is the wettest at 2.2 inches of precipitation on average and August the driest at 0.6 inches; the year adds up to 15.2 inches over 46 days with at least a tenth of an inch. Highs reach 90°F on about 16 days a year, almost all from July to September. Lows fall below freezing on about 247 nights a year. Snowfall averages 51.8 inches a year, most of it in January. That 15.2 inches is more than at 37 of the 58 Montana stations used on this site (64%). Missoula, 18 miles west, has its own station (Missoula 2 NE, MT): 17.4 inches a year, 2.2 more than here, and a July average high of 85°F against 82°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" | Snow in |
|---|---|---|---|---|---|
| Jan | 30 | 8 | 1.4 | 4 | 15.5 |
| Feb | 35 | 9 | 1.0 | 4 | 7.2 |
| Mar | 46 | 18 | 0.8 | 3 | 4.6 |
| Apr | 54 | 24 | 1.1 | 4 | 1.3 |
| May | 64 | 30 | 1.9 | 5 | 0.4 |
| Jun | 71 | 38 | 2.2 | 6 | 0.0 |
| Jul | 82 | 41 | 0.8 | 3 | 0.0 |
| Aug | 82 | 39 | 0.6 | 2 | 0.0 |
| Sep | 71 | 32 | 0.9 | 3 | 0.2 |
| Oct | 55 | 23 | 1.5 | 4 | 1.9 |
| Nov | 39 | 16 | 1.6 | 5 | 7.4 |
| Dec | 29 | 9 | 1.4 | 4 | 13.3 |
| Year | 55 | 24 | 15.2 | 46 | 51.8 |
Averages for 1991–2020 at Potomac, MT (3,690 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 Bonner
Since 1996, the National Weather Service has logged 6 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Bonner: 6 thunderstorm wind reports. 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 64 mph, on July 3, 1998.
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
Missoula County, which includes Bonner, has been named in 21 federal disaster or emergency declarations since 1974, 11 of them major disasters (by incident: 8 fires, 4 severe storms, 3 floods, 2 biological emergencies). The latest major disaster declaration was Severe Winter Storm and Straight-Line Winds, on April 7, 2026. FEMA's National Risk Index gives Missoula County a Relatively Low rating for natural hazard risk overall; by hazard: Relatively Moderate for lightning; Relatively Low for inland flooding, strong wind and heat waves; Very Low for tornadoes and hail. It models the county's expected loss from all 18 hazards it covers at $56.7 million a year, the 4th highest of 56 Montana counties; of the hazards above, the largest share, $19.0 million (34%), 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 Bonner
- Missoula, MT18 mi
- Arlee, MT27 mi
- Florence, MT27 mi
- Frenchtown, MT31 mi
- Stevensville, MT32 mi
- St Ignatius, MT34 mi
- Lolo, MT35 mi
- Victor, MT44 mi
- Corvallis, MT45 mi
- Ronan, MT50 mi
- Hamilton, MT53 mi
- Deer Lodge, MT55 mi
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