NHC HURDAT2 · SPC Tornado Database
Hurricanes and Tornadoes That Hit Iona, ID
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 Iona, Idaho since records began in 1851. Since 1950, 19 tornadoes have touched down within 25 miles, 0 of them rated EF3 or stronger.
- Hurricanes
- 0
- Tropical storms
- 0
- Tornadoes
- 19
- 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 Iona
The strongest of the 19 tornadoes within 25 miles was an F2 on April 7, 1978; its path came within 12 miles. Of the 19, none had a path within 5 miles of the city centre, and 6 have come since 2000. June has had the most tornadoes, 5. The most recent tornado was on October 27, 2025. Iona has more tornadoes within 25 miles than 68% of the 90 Idaho cities on this site. Hail has been reported within 10 miles 11 times since 1962, with stones up to 1.25 inches (half dollar size). Iona has more hail reports within 10 miles than 52% of the 90 Idaho cities.
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Tornadoes within 25 miles of Iona
By decade
- 2020s1
- 2010s2
- 2000s3
- 1990s3
- 1980s7
- 1970s1
- 1960s1
- 1950s1
| Date | Rating | Distance | Path | Killed / injured |
|---|---|---|---|---|
| Apr 7, 1978 | F2 | 12 mi | 1.5 mi | 0 / 1 |
| Feb 14, 2000 | F1 | 10 mi | 9 mi | 0 / 1 |
| Feb 14, 2000 | F1 | 8 mi | 12 mi | 0 / 0 |
| Jun 2, 1992 | F1 | 21 mi | 0.5 mi | 0 / 0 |
| Jun 4, 1991 | F1 | 16 mi | 0.2 mi | 0 / 0 |
| Apr 17, 1988 | F1 | 16 mi | 0.5 mi | 0 / 0 |
| Apr 17, 1988 | F1 | 22 mi | 2 mi | 0 / 0 |
| Mar 23, 1988 | F1 | 18 mi | 15 mi | 0 / 0 |
| Apr 21, 1981 | F1 | 20 mi | 1.1 mi | 0 / 0 |
| Jul 8, 1980 | F1 | 17 mi | 0.1 mi | 0 / 0 |
| Mar 13, 1959 | F1 | 13 mi | 0.4 mi | 0 / 0 |
| Oct 27, 2025 | EF0 | 20 mi | 0.14 mi | 0 / 0 |
The strongest 12 of 19, by rating and then by deaths. Ratings before February 2007 are on the original Fujita scale.
Hail in Iona
The Storm Prediction Center has 11 hail reports within 10 miles of Iona since 1962. Of these, 8 were 1 inch across or larger, and none reached 2 inches. The largest size, 1.25 inches (half dollar size), was reported on 2 days, most recently July 2, 2022. The most recent report is from August 5, 2023. June has the most reports, 4.
Source: NOAA Storm Prediction Center severe weather reports, data through 2025.
Weather by month in Iona
The nearest NOAA station with 1991–2020 climate normals is Idaho Falls 16 SE, ID, 5 miles southeast of Iona at 5,828 feet. July is the warmest, with an average high of 81°F and low of 50°F; December is the coolest, at 30°F and 13°F. May is the wettest at 2.2 inches of precipitation on average and July and August the driest at 0.9 inches; the year adds up to 17.5 inches over 54 days with at least a tenth of an inch. Highs reach 90°F on about 5 days a year, almost all from July to August. Lows fall below freezing on about 199 nights a year. Snowfall averages 65.7 inches a year, most of it in January. That 17.5 inches is more than at 43 of the 66 Idaho stations used on this site (65%). Ammon, 7 miles northwest, has its own station (Idaho Falls - Kifi, ID): 13.6 inches a year, 3.9 less than here, and a July average high of 86°F against 81°F.
| Month | High °F | Low °F | Precip. in | Days ≥ 0.1" | Snow in |
|---|---|---|---|---|---|
| Jan | 31 | 14 | 1.8 | 6 | 17.0 |
| Feb | 34 | 15 | 1.2 | 4 | 11.8 |
| Mar | 42 | 24 | 1.4 | 4 | 7.6 |
| Apr | 51 | 29 | 1.6 | 5 | 2.9 |
| May | 62 | 37 | 2.2 | 6 | 0.9 |
| Jun | 71 | 43 | 1.4 | 5 | 0.2 |
| Jul | 81 | 50 | 0.9 | 3 | 0.0 |
| Aug | 79 | 48 | 0.9 | 3 | 0.0 |
| Sep | 70 | 40 | 1.4 | 4 | 0.0 |
| Oct | 56 | 30 | 1.4 | 5 | 1.7 |
| Nov | 41 | 21 | 1.4 | 5 | 7.6 |
| Dec | 30 | 13 | 1.9 | 5 | 16.0 |
| Year | 54 | 30 | 17.5 | 54 | 65.7 |
Averages for 1991–2020 at Idaho Falls 16 SE, ID (5,828 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 Iona
Since 1996, the National Weather Service has logged 22 flood, rain, thunderstorm wind and lightning events that began within 10 miles of Iona: 19 thunderstorm wind reports, 2 floods and 1 lightning strike. None is recorded as killing or injuring anyone; the NWS estimated $219,000 in property and crop damage. The strongest thunderstorm gust on record here was 69 mph, on February 14, 2000.
February 14, 2000: thunderstorm wind 7 miles from the centre of Iona — $200,000 damage.
NWS: “A warehouse roof was torn off and crushed a car. Many large trees were downed, closing city streets in Idaho Falls and crushing at least one car.”
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
Bonneville County, which includes Iona, has been named in 7 federal disaster or emergency declarations since 1964, 4 of them major disasters (by incident: 2 biological emergencies, 2 floods, 1 fire, 1 hurricane). The latest major disaster declaration was Covid-19 Pandemic, on April 9, 2020. FEMA's National Risk Index gives Bonneville County a Relatively Moderate rating for natural hazard risk overall; by hazard: Relatively High for lightning; Relatively Moderate for hail, inland flooding and heat waves; Relatively Low for strong wind; Very Low for tornadoes. It models the county's expected loss from all 18 hazards it covers at $64.7 million a year, the 2nd highest of 44 Idaho counties; of the hazards above, the largest share, $24.3 million (38%), 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 Iona
- Ammon, ID7 mi
- Idaho Falls, ID11 mi
- Shelley, ID14 mi
- Rigby, ID19 mi
- Rexburg, ID28 mi
- Blackfoot, ID31 mi
- Sugar City, ID32 mi
- Victor, ID38 mi
- Saint Anthony, ID39 mi
- Chubbuck, ID42 mi
- Driggs, ID43 mi
- Tetonia, ID44 mi
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