McHenry County tornado history

30 tornadoes touched McHenry County, Illinois between 1950 and 2025 — about 0.4 a year. The strongest was rated F4 (Apr 21, 1967). Tornadoes here killed 32 and injured 637 people.

30tornadoes since 1950

F4strongest rating

32killed · 637 injured

81 milongest path · 1958

(E)F0(E)F1(E)F2(E)F3(E)F4(E)F5· dots = start point only

By rating

(E)F012

(E)F18

(E)F25

(E)F31

(E)F43

(E)F50

unrated1

By month

JFMAMJJASOND

Peak month: April.

By decade

’50’60’70’80’90’00’10’20

Strongest tornadoes

Date	Rating	Path	Width	Injured	Killed
Apr 21, 1967	F4	25.5 mi	1,200 yd	450	24
Apr 11, 1965	F4	9.1 mi	400 yd	75	6
Apr 21, 1967	F4	8.8 mi	150 yd	100	1
Jan 7, 2008	EF3	13.1 mi	100 yd	5	0
Oct 8, 1958	F2	81 mi	10 yd	0	1
Nov 22, 2010	EF2	18.1 mi	200 yd	6	0
Oct 8, 1959	F2	2 mi	90 yd	1	0
Aug 15, 1978	F2	2 mi	100 yd	0	0
Apr 19, 1963	F2	0.1 mi	10 yd	0	0
May 17, 2017	EF1	10.3 mi	100 yd	0	0
Jul 12, 2023	EF1	6.4 mi	200 yd	0	0
Aug 10, 2020	EF1	5.7 mi	200 yd	0	0

Most recent tornadoes

Date	Rating	Path	Width	Injured
May 7, 2024	EF0	14.3 mi	50 yd	0
Jul 12, 2023	EF1	6.4 mi	200 yd	0
Jul 12, 2023	EF0	3.4 mi	125 yd	0
May 31, 2023	unrated	0.6 mi	25 yd	0
Aug 9, 2021	EF1	0.4 mi	70 yd	0
Aug 10, 2020	EF1	5.7 mi	200 yd	0
May 17, 2017	EF1	10.3 mi	100 yd	0
Jul 18, 2015	EF0	0.1 mi	50 yd	0
Jul 18, 2015	EF0	0.1 mi	50 yd	0
Apr 9, 2015	EF1	0.3 mi	30 yd	0
Nov 22, 2010	EF2	18.1 mi	200 yd	6
Nov 22, 2010	EF1	5.5 mi	100 yd	0

Deadliest: Apr 21, 1967, F4, 24 killed.

Nearby counties

Boone County, IL25 Walworth County, WI41 Kane County, IL46 DeKalb County, IL30 Kenosha County, WI12 Lake County, IL22 Winnebago County, IL24 DuPage County, IL46

Questions

How many tornadoes has McHenry County, Illinois had?

30 tornadoes touched McHenry County, Illinois between 1950 and 2025 in the NOAA Storm Prediction Center database — about 0.4 per year.

What was the strongest tornado in McHenry County?

The strongest rating recorded was F4 on Apr 21, 1967, with a 25.5-mile path and 24 deaths.

When is tornado season in McHenry County?

Most of its tornadoes happened in April (6 of 30). Tornadoes can occur in any month, so keep alerts on year-round.

Right now: live tornado warnings map · alerts for your location. Dates link to that day’s full storm reports where available (2004 onward).