Tornado History Map

Knox County, Illinois tornado history

38 tornadoes recorded in or across Knox County from 1961 to 2025, coloured by rating on the map.

Tap or scroll to load the interactive map

Years1950 to 2025
Rating (F or EF scale)

Shows tornadoes that started in, or crossed, the chosen state. To see how many have passed near you, search a town or ZIP code, or tap the map.

Key
  • F0 / EF0 Light damage
  • F1 / EF1 Moderate damage
  • F2 / EF2 Considerable damage
  • F3 / EF3 Severe damage
  • F4 / EF4 Devastating damage
  • F5 / EF5 Incredible damage
  • Unknown Not rated (2007 onwards)

How to read the lines. Each line is one tornado, drawn from where it started to where it ended, coloured and sized by its rating. A dot means the record has no end point. Tap a line for its details, or tap anywhere else to see how many tornadoes have passed nearby. Weaker tornadoes appear as you zoom in. Ratings use the Fujita (F) scale before 1 February 2007 and the Enhanced Fujita (EF) scale from then on.

Tornadoes in Knox County

The Storm Prediction Center records 38 tornadoes whose paths touched Knox County, Illinois between 1961 and 2025. None of them is recorded as having killed anyone. The busiest month is June, with 11 tornadoes. The strongest was an F4 on 13 May 1995. The most recent was on 20 April 2025.

  • 38tornadoes
  • 0deaths
  • 22injuries
  • 530per 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 Knox County?

RatingTornadoesShare
F0 / EF01539%
F1 / EF11437%
F2 / EF2513%
F3 / EF325%
F4 / EF413%
F5 / EF500%
Unknown rating13%

Knox County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 9 in 1990s.1960s51970s81980s21990s92000s42010s52020s5

The 2020s only run to 2025, so that bar is for a shorter period. The record starts in 1950.

Show the numbers
PeriodCount
1960s5
1970s8
1980s2
1990s9
2000s4
2010s5
2020s5
Tornadoes by month
Bar chart of tornadoes by period. The most is 11 in Jun.Jan0Feb0Mar4Apr6May7Jun11Jul7Aug2Sep1Oct0Nov0Dec0
Show the numbers
PeriodCount
Jan0
Feb0
Mar4
Apr6
May7
Jun11
Jul7
Aug2
Sep1
Oct0
Nov0
Dec0

Records for Knox County

  • Strongest: Nauvoo, Illinois tornado13 May 1995, F4, 7 injuries, 50 miles long
  • Longest path: Illinois tornado21 July 1961, F1, 147.4 miles long
  • Most recent: Illinois tornado20 April 2025, EF1, 4.4 miles long

Notable tornadoes in Knox County

Many of these tornadoes killed or injured people. The numbers are the official record's, and they may be revised.

More in Illinois

Embed this map

Copy this code into your web page. It is free to use. Please keep the link under the map, as it is how people find where the map comes from.