Tornadoes in Johnson County
The Storm Prediction Center records 23 tornadoes whose paths touched Johnson County, Illinois between 1957 and 2025. They killed 3 people and injured 60. The busiest month is May, with 7 tornadoes. The strongest was an F4 on 6 May 2003. The most recent was on 2 April 2025.
- 23tornadoes
- 3deaths
- 60injuries
- 669per 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 Johnson County?
| Rating | Tornadoes | Share |
|---|---|---|
| F0 / EF0 | 4 | 17% |
| F1 / EF1 | 6 | 26% |
| F2 / EF2 | 9 | 39% |
| F3 / EF3 | 3 | 13% |
| F4 / EF4 | 1 | 4% |
| F5 / EF5 | 0 | 0% |
| Unknown rating | 0 | 0% |
Johnson 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 |
| 1970s | 4 |
| 1980s | 1 |
| 1990s | 2 |
| 2000s | 8 |
| 2010s | 3 |
| 2020s | 4 |
Show the numbers
| Period | Count |
|---|---|
| Jan | 1 |
| Feb | 0 |
| Mar | 2 |
| Apr | 6 |
| May | 7 |
| Jun | 3 |
| Jul | 0 |
| Aug | 0 |
| Sep | 0 |
| Oct | 3 |
| Nov | 0 |
| Dec | 1 |
Records for Johnson County
- Deadliest and Strongest: New Grand Chain, Illinois tornado6 May 2003, F4, 2 deaths, 33 injuries, 33 miles long
- Longest path: Illinois tornado18 January 1973, F1, 95.9 miles long
- Most recent: Illinois tornado2 April 2025, EF2, 6.2 miles long
Notable tornadoes in Johnson County
- New Grand Chain, Illinois tornado6 May 2003, F4, 2 deaths, 33 injuries, 33 miles long
- Mill Creek, Illinois tornado28 April 2002, F3, 1 death, 10 injuries, 19.3 miles long
Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.