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.
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Key Tornado Statistics
Key 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
This map covers the wider location—not your exact property.Measure the closest recorded track to a street address in or near Decatur, Iowa.
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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 sourced from NOAA Storm Prediction Center and the NCEI Storm Events Database. TornadoTrace summarizes reported weather events for screening and research; it is not a damage assessment, inspection, or insurance determination. Coordinates and records can be approximate, incomplete, revised, or missing. No warranty of completeness or accuracy.