Severe Weather History


Hazard archive · 1950 — present

Tornado in Cook County, Illinois

85

Recorded events

39

Direct deaths

771

Direct injuries

$118.3M

Property damage

Tornado in Cook County, Illinois: 85 recorded events between 1954 and 2025. The strongest on record measured F4. That places the county #97 nationally and #4 statewide for this hazard.

Decade by decade

Tornado in Cook County, Illinois: events per decade

Tornado in Cook County, Illinois: recorded events per decade
Tornado in Cook County, Illinois: recorded events per decade

Reporting practice changed over time — early decades are undercounted, not calmer.

The busiest decade for tornado in Cook County is the 2020s, when 30 of the county's 85 recorded events were logged. Comparing decades is useful for spotting active periods, but the earliest years are thin because systematic reporting for this hazard began later.

Within the Cook County archive, tornado makes up 3.2% of all recorded severe weather across 8 hazard types. Nationally the county sits at #97 for this hazard and #4 within Illinois, putting it in the 96.8 percentile of all U.S. counties.

Seasonality

Events by month

0Jan
3Feb
4Mar
7Apr
11May
19Jun
23Jul
9Aug
7Sep
1Oct
1Nov
0Dec

Jul is the peak month for tornado in Cook County with 23 recorded events, while Jan is the quietest. Seasonality here is a property of the archive as much as the climate: reports cluster where population and spotter networks are densest.

Tornado tracks

Paths crossing this county

DateScalePath lengthMax widthOrigin
1967-04-21EF415.0 mi200 ydTouched down here
1976-06-13EF43.3 mi1,760 ydTouched down here
2021-06-20EF317.6 mi600 ydCrossed in
1991-03-27EF315.0 mi200 ydCrossed in
1976-03-12EF215.1 mi150 ydTouched down here
1965-11-12EF235.9 mi120 ydCrossed in
1966-06-09EF22.5 mi10 ydTouched down here
1961-03-04EF27.9 mi100 ydTouched down here
2024-07-15EF234.6 mi325 ydCrossed in
2008-06-07EF26.5 mi150 ydCrossed in
Source: NOAA SPC SVRGIS tornado tracks · path geometry intersected with county boundaries

Significant events

Deadliest on record

DateLocationScaleDeathsInjuriesDamage
Apr 21, 1967F433500$25.0M
Mar 12, 1976F2241$2.5M
Jun 13, 1976F4223$2.5M
Mar 4, 1961F21115$25.0M
Jun 9, 1966F2130$0
Sep 27, 1959F1014$250K
Sep 29, 1986F1010$250K
Jun 23, 1962F2010$250K
Source: NOAA/NCEI Storm Events · dates UTC

Most recent

Latest recorded events

DateLocationMagnitudeDamage
Mar 19, 2025LYNWOODEF0$0
Jul 16, 2024UKRAINIAN VILLAGEEF0$0
Jul 16, 2024ASHBURNEF1$0
Jul 16, 2024EAST GARFIELD PARKEF1$0
Jul 16, 2024MARKHAMEF0$0
Jul 16, 2024FLOSSMOOREF1$0
Jul 16, 2024OAK FORESTEF0$0
Jul 16, 2024PALOS HEIGHTSEF0$0
Jul 16, 2024MATTESONEF2$0
Jul 16, 2024WILLOW SPRINGSEF1$0
Source: NOAA/NCEI Storm Events · dates UTC · recent entries may be preliminary

Other hazards here

More from Cook County

County overview →

From the record

What the reports say

Written by National Weather Service staff at the time of the event · public domain

Quick answers

Frequently asked

How many tornado events are on record in Cook County, Illinois?

85 tornado events are recorded in Cook County between 1954 and 2025, causing 39 direct deaths.

What is the strongest tornado recorded in Cook County?

The strongest tornado on record in Cook County measured F4.

Where does the tornado data for Cook County come from?

All events come from the NOAA/NCEI Storm Events Database, the federal public-domain archive of severe weather reports. Dates are UTC, damage is as reported and not inflation-adjusted, and the most recent entries may still be revised.

Cite this page

“Tornado in Cook County, Illinois.” Severe Weather History. severeweatherhistory.com/county/illinois/cook-county/tornado/ · Data: NOAA/NCEI, FEMA, U.S. Census — public domain.


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