Tornado History Map

Mercer County, Illinois tornado history

48 tornadoes recorded in or across Mercer County from 1952 to 2025, coloured by rating on the map.

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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 Mercer County

The Storm Prediction Center records 48 tornadoes whose paths touched Mercer County, Illinois between 1952 and 2025. None of them is recorded as having killed anyone. The busiest month is April, with 17 tornadoes. The strongest was an F3 on 14 June 1974. The most recent was on 3 June 2025.

  • 48tornadoes
  • 0deaths
  • 6injuries
  • 855per 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 Mercer County?

RatingTornadoesShare
F0 / EF01531%
F1 / EF12348%
F2 / EF2613%
F3 / EF324%
F4 / EF400%
F5 / EF500%
Unknown rating24%

Mercer County tornadoes over time

Tornadoes by decade
Bar chart of tornadoes by period. The most is 12 in 2000s.1950s11960s21970s61980s11990s72000s122010s82020s11

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

Show the numbers
PeriodCount
1950s1
1960s2
1970s6
1980s1
1990s7
2000s12
2010s8
2020s11
Tornadoes by month
Bar chart of tornadoes by period. The most is 17 in Apr.Jan0Feb0Mar0Apr17May6Jun11Jul8Aug3Sep0Oct0Nov2Dec1
Show the numbers
PeriodCount
Jan0
Feb0
Mar0
Apr17
May6
Jun11
Jul8
Aug3
Sep0
Oct0
Nov2
Dec1

Records for Mercer County

  • Strongest and Longest path: Illinois tornado14 June 1974, F3, 2 injuries, 48.6 miles long
  • Most recent: Illinois tornado3 June 2025, EF1, 3.8 miles long

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

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