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Tornado History
Knox Tornado History
This county-level tornado history page focuses on Knox, Illinois. The records below identify 28 tornadoes from 1961 through 2025, including a highest listed rating of F3 (Severe damage). NOAA damage estimates in this group total at least $7.2M, with 0 deaths and 14 injuries recorded across the listed events.
Key Tornado Statistics
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Check any addressKey Tornado Facts for Knox, Illinois
Top local patterns from the historical tornado records in this group.
Average 0.4 tornadoes per year (0.7/yr in last decade)
June is the peak tornado month with 10 recorded events
Deadliest tornado: F3 in Knox, Illinois with 0 deaths
1974 was the most active year with 5 tornadoes
The 1970s had the most tornado activity (7 events)
Longest tornado: 70.1 miles in Knox, Illinois
Widest tornado: 880.0 yards in Knox, Illinois
Most tornadoes in one day: 4 on Jun 20, 1974
Monthly Distribution
Shows tornado frequency across months of the year, highlighting seasonal patterns and peak tornado periods.
Summary: In Knox, Illinois, June is the most active month with 10 tornadoes.
Annual Tornado Trend
Shows year-by-year tornado counts, making active years and quiet stretches easier to spot.
Summary: 1974 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 1961 with at least $2.8M 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 |
|---|---|---|---|---|---|---|---|
| May 14, 1961 | F3 | Knox, Illinois | 17.3 mi | 100 yd | 0 | 8 | $2.5M |
| June 14, 1974 | F3 | Knox, Illinois | 14.9 mi | 33 yd | 0 | 1 | N/A |
| May 13, 1995 | F2 | Knox, Illinois | 14 mi | 880 yd | 0 | 2 | $1.6M |
| June 5, 2010 | EF2 | Knox, Illinois | 5.71 mi | 50 yd | 0 | 0 | $420K |
| March 23, 1975 | F2 | Knox, Illinois | 1 mi | 80 yd | 0 | 2 | $25K |
| March 4, 1976 | F2 | Knox, Illinois | 0.1 mi | 440 yd | 0 | 0 | $25K |
| June 29, 1998 | F1 | Knox, Illinois | 3 mi | 200 yd | 0 | 1 | $2.0M |
| July 21, 1961 | F1 | Knox, Illinois | 70.1 mi | 33 yd | 0 | 0 | $250K |
| May 7, 1967 | F1 | Knox, Illinois | 1.3 mi | 150 yd | 0 | 0 | $250K |
| June 18, 2021 | EF1 | Knox, Illinois | 10.26 mi | 250 yd | 0 | 0 | $150K |
| July 6, 1987 | F1 | Knox, Illinois | 0.1 mi | 20 yd | 0 | 0 | $2K |
| June 20, 1974 | F1 | Knox, Illinois | 0 mi | 33 yd | 0 | 0 | N/A |
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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.