Tornado History
Delaware Tornado History
This county-level tornado history page focuses on Delaware, Iowa. The records below identify 40 tornadoes from 1960 through 2026, including a highest listed rating of F4 (Devastating damage). NOAA damage estimates in this group total at least $32.7M, with 0 deaths and 20 injuries recorded across the listed events.
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Key Tornado Statistics
Key Tornado Facts for Delaware, Iowa
Top local patterns from the historical tornado records in this group.
Average 0.6 tornadoes per year (1.1/yr in last decade)
May is the peak tornado month with 9 recorded events
Deadliest tornado: F2 in Delaware, Iowa with 0 deaths
1991 was the most active year with 5 tornadoes
The 1990s had the most tornado activity (7 events)
Longest tornado: 26.9 miles in Delaware, Iowa
Widest tornado: 880.0 yards in Delaware, Iowa
Most tornadoes in one day: 3 on Jul 14, 2021
Monthly Distribution
Shows tornado frequency across months of the year, highlighting seasonal patterns and peak tornado periods.
Summary: In Delaware, Iowa, May is the most active month with 9 tornadoes.
Annual Tornado Trend
Shows year-by-year tornado counts, making active years and quiet stretches easier to spot.
Summary: 1991 was the most active year with 5 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 1990 with at least $25.2M 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 Delaware, 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 |
|---|---|---|---|---|---|---|---|
| March 13, 1990 | F4 | Delaware, Iowa | 9 mi | 200 yd | 0 | 0 | $25.0M |
| August 12, 1974 | F4 | Delaware, Iowa | 5 mi | 400 yd | 0 | 12 | $2.5M |
| July 12, 1971 | F3 | Delaware, Iowa | 0 mi | 833 yd | 0 | 2 | $2.5M |
| November 15, 1960 | F2 | Delaware, Iowa | 10.5 mi | 70 yd | 0 | 0 | $250K |
| May 4, 1964 | F2 | Delaware, Iowa | 4.7 mi | 200 yd | 0 | 2 | $250K |
| June 26, 1969 | F2 | Delaware, Iowa | 26.9 mi | 300 yd | 0 | 0 | $250K |
| November 15, 1988 | F2 | Delaware, Iowa | 11 mi | 63 yd | 0 | 0 | $250K |
| June 2, 1990 | F2 | Delaware, Iowa | 5 mi | 67 yd | 0 | 0 | $250K |
| March 22, 1991 | F2 | Delaware, Iowa | 17 mi | 80 yd | 0 | 1 | $250K |
| June 28, 2017 | EF2 | Delaware, Iowa | 1.22 mi | 30 yd | 0 | 0 | N/A |
| April 26, 2009 | EF1 | Delaware, Iowa | 6.06 mi | 100 yd | 0 | 0 | $500K |
| March 31, 2007 | EF1 | Delaware, Iowa | 7.85 mi | 200 yd | 0 | 0 | $162K |
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Related Location Pages
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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.