Tornadoes in DeKalb County
The Storm Prediction Center records 32 tornadoes whose paths touched DeKalb County, Illinois between 1958 and 2024. They killed 2 people and injured 12. The busiest month is August, with 9 tornadoes. The strongest was an EF4 on 9 April 2015. The most recent was on 15 July 2024.
- 32tornadoes
- 2deaths
- 12injuries
- 507per 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 DeKalb County?
| Rating | Tornadoes | Share |
|---|---|---|
| F0 / EF0 | 17 | 53% |
| F1 / EF1 | 9 | 28% |
| F2 / EF2 | 2 | 6% |
| F3 / EF3 | 0 | 0% |
| F4 / EF4 | 1 | 3% |
| F5 / EF5 | 0 | 0% |
| Unknown rating | 3 | 9% |
DeKalb County tornadoes over time
The 2020s only run to 2024, so that bar is for a shorter period. The record starts in 1950.
Show the numbers
| Period | Count |
|---|---|
| 1950s | 2 |
| 1960s | 2 |
| 1970s | 3 |
| 1980s | 1 |
| 1990s | 2 |
| 2000s | 4 |
| 2010s | 4 |
| 2020s | 14 |
Show the numbers
| Period | Count |
|---|---|
| Jan | 0 |
| Feb | 2 |
| Mar | 0 |
| Apr | 4 |
| May | 6 |
| Jun | 5 |
| Jul | 4 |
| Aug | 9 |
| Sep | 1 |
| Oct | 0 |
| Nov | 1 |
| Dec | 0 |
Records for DeKalb County
- Deadliest and Strongest: Franklin Grove, Illinois tornado9 April 2015, EF4, 2 deaths, 11 injuries, 30.1 miles long
- Longest path: Illinois tornado15 August 1958, F2, 74.5 miles long
- Most recent: Illinois tornado15 July 2024, Unknown rating, 1.8 miles long
Notable tornadoes in DeKalb County
- Franklin Grove, Illinois tornado9 April 2015, EF4, 2 deaths, 11 injuries, 30.1 miles long
Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.