Tornadoes in Williamson County
The Storm Prediction Center records 24 tornadoes whose paths touched Williamson County, Illinois between 1957 and 2025. They killed 21 people and injured 407. The busiest month is April, with 10 tornadoes. The strongest was an F4 on 18 December 1957. The most recent was on 16 May 2025.
- 24tornadoes
- 21deaths
- 407injuries
- 571per 10,000 sq mi of land
A tornado that crossed several counties counts in each one, so county counts add up to more than the state's.
How strong were the tornadoes in Williamson County?
| Rating | Tornadoes | Share |
|---|---|---|
| F0 / EF0 | 2 | 8% |
| F1 / EF1 | 13 | 54% |
| F2 / EF2 | 5 | 21% |
| F3 / EF3 | 1 | 4% |
| F4 / EF4 | 3 | 13% |
| F5 / EF5 | 0 | 0% |
| Unknown rating | 0 | 0% |
Williamson County tornadoes over time
The 2020s only run to 2025, so that bar is for a shorter period. The record starts in 1950.
Show the numbers
| Period | Count |
|---|---|
| 1950s | 1 |
| 1960s | 1 |
| 1970s | 1 |
| 1980s | 1 |
| 1990s | 2 |
| 2000s | 2 |
| 2010s | 10 |
| 2020s | 6 |
Show the numbers
| Period | Count |
|---|---|
| Jan | 0 |
| Feb | 2 |
| Mar | 0 |
| Apr | 10 |
| May | 5 |
| Jun | 3 |
| Jul | 0 |
| Aug | 0 |
| Sep | 0 |
| Oct | 2 |
| Nov | 1 |
| Dec | 1 |
Records for Williamson County
- Deadliest and Strongest and Longest path: Carbondale, Illinois tornado18 December 1957, F4, 11 deaths, 200 injuries, 28.3 miles long
- Most recent: Marion, Illinois tornado16 May 2025, EF4, 7 injuries, 16.3 miles long
Notable tornadoes in Williamson County
- Carbondale, Illinois tornado18 December 1957, F4, 11 deaths, 200 injuries, 28.3 miles long
- Marion, Illinois tornado29 May 1982, F4, 10 deaths, 181 injuries, 17 miles long
- Marion, Illinois tornado16 May 2025, EF4, 7 injuries, 16.3 miles long
Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.