Tornadoes in Grundy County
The Storm Prediction Center records 26 tornadoes whose paths touched Grundy County, Illinois between 1955 and 2024. They killed 2 people and injured 106. The busiest month is June, with 8 tornadoes. The strongest was an F3 on 17 July 1972. The most recent was on 15 July 2024.
- 26tornadoes
- 2deaths
- 106injuries
- 622per 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 Grundy County?
| Rating | Tornadoes | Share |
|---|---|---|
| F0 / EF0 | 9 | 35% |
| F1 / EF1 | 5 | 19% |
| F2 / EF2 | 9 | 35% |
| F3 / EF3 | 2 | 8% |
| F4 / EF4 | 0 | 0% |
| F5 / EF5 | 0 | 0% |
| Unknown rating | 1 | 4% |
Grundy 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 | 4 |
| 1980s | 4 |
| 2000s | 1 |
| 2010s | 9 |
| 2020s | 4 |
Show the numbers
| Period | Count |
|---|---|
| Jan | 0 |
| Feb | 1 |
| Mar | 0 |
| Apr | 5 |
| May | 5 |
| Jun | 8 |
| Jul | 3 |
| Aug | 0 |
| Sep | 0 |
| Oct | 0 |
| Nov | 3 |
| Dec | 1 |
Records for Grundy County
- Deadliest: Illinois tornado12 November 1965, F2, 2 deaths, 90 injuries, 35.9 miles long
- Strongest and Longest path: Illinois tornado17 July 1972, F3, 81.5 miles long
- Most recent: Illinois tornado15 July 2024, EF2, 2 injuries, 34.6 miles long
Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.