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Tornado History
Decatur Tornado History
This county-level tornado history page focuses on Decatur, Iowa. The records below identify 18 tornadoes from 1957 through 2022, including a highest listed rating of F4 (Devastating damage). NOAA damage estimates in this group total at least $56.1M, with 0 deaths and 2 injuries recorded across the listed events.
Key Tornado Statistics
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Check any addressKey Tornado Facts for Decatur, Iowa
Top local patterns from the historical tornado records in this group.
Average 0.3 tornadoes per year (0.2/yr in last decade)
July is the peak tornado month with 4 recorded events
Deadliest tornado: Unknown in Decatur, Iowa with 0 deaths
1986 was the most active year with 4 tornadoes
The 1980s had the most tornado activity (7 events)
Longest tornado: 22 miles in Decatur, Iowa
Widest tornado: 600.0 yards in Decatur, Iowa
Most tornadoes in one day: 2 on Jul 8, 1986
Monthly Distribution
Shows tornado frequency across months of the year, highlighting seasonal patterns and peak tornado periods.
Summary: In Decatur, Iowa, July is the most active month with 4 tornadoes.
Annual Tornado Trend
Shows year-by-year tornado counts, making active years and quiet stretches easier to spot.
Summary: 1986 was the most active year with 4 recorded tornadoes.
Property Damage Trends
Visualizes reported property damage over time. Bars use a log-like scale so very large damage years do not flatten the rest of the chart.
Summary: The highest reported property damage year in this group is 1984 with at least $25.0M in NOAA-listed property damage.
Historical Track Sketch
Notable Tornado Records
The table highlights the strongest and most damaging records in this page's local dataset. Damage totals are NOAA-reported minimum estimates where available.
| Date | Rating | Area | Length | Width | Deaths | Injuries | Min. property damage |
|---|---|---|---|---|---|---|---|
| June 7, 1984 | F4 | Decatur, Iowa | 22 mi | 250 yd | 0 | 0 | $25.0M |
| May 24, 1989 | F4 | Decatur, Iowa | 9 mi | 300 yd | 0 | 0 | $25.0M |
| June 2, 1980 | F4 | Decatur, Iowa | 16.5 mi | 140 yd | 0 | 0 | $2.5M |
| April 23, 1961 | F2 | Decatur, Iowa | 9.3 mi | 600 yd | 0 | 2 | $2.5M |
| March 5, 2022 | EF2 | Decatur, Iowa | 9.81 mi | 300 yd | 0 | 0 | $500K |
| June 22, 1964 | F2 | Decatur, Iowa | 1 mi | 200 yd | 0 | 0 | $250K |
| May 7, 1975 | F2 | Decatur, Iowa | 0 mi | 33 yd | 0 | 0 | $25K |
| July 13, 1986 | F1 | Decatur, Iowa | 0.5 mi | 40 yd | 0 | 0 | $250K |
| November 11, 2015 | EF1 | Decatur, Iowa | 9.34 mi | 200 yd | 0 | 0 | $5K |
| June 22, 1958 | F1 | Decatur, Iowa | 1 mi | 50 yd | 0 | 0 | $2K |
| August 20, 1964 | F0 | Decatur, Iowa | 0.5 mi | 50 yd | 0 | 0 | $25K |
| May 10, 1986 | F0 | Decatur, Iowa | 0.1 mi | 10 yd | 0 | 0 | $2K |
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Source And Limits
Data source: NOAA/NCEI. TornadoTrace summarizes historical records for screening and research. Coordinates, damage estimates, narratives, and event details can be approximate, incomplete, revised, or missing. Do not use this page as legal, insurance, engineering, real estate, emergency management, or safety advice.