Stephenson County tornado history

21 tornadoes touched Stephenson County, Illinois between 1950 and 2025 — about 0.3 a year. The strongest was rated F2 (Oct 8, 1958). Tornadoes here killed 1 and injured 0 people.

21tornadoes since 1950
F2strongest rating
1killed · 0 injured
81 milongest path · 1958
(E)F0(E)F1(E)F2(E)F3(E)F4(E)F5· dots = start point only

By rating

(E)F011
(E)F16
(E)F22
(E)F30
(E)F40
(E)F50
unrated2

By month

JFMAMJJASOND

Peak month: June.

By decade

’50’60’70’80’90’00’10’20

Strongest tornadoes

DateRatingPathWidthInjuredKilled
Oct 8, 1958F281 mi10 yd01
Jul 15, 2024EF215.4 mi150 yd00
Mar 31, 2023EF111 mi200 yd00
Aug 16, 2017EF12.8 mi75 yd00
Apr 17, 1959F12 mi10 yd00
May 25, 2022EF11.8 mi30 yd00
Aug 24, 1998F10.5 mi50 yd00
Jun 1, 1971F10.1 mi10 yd00
Aug 10, 2020EF04.6 mi50 yd00
Aug 16, 2017EF03.3 mi20 yd00
Jun 14, 2003F00.5 mi50 yd00
Jun 1, 2009EF00.3 mi200 yd00

Most recent tornadoes

DateRatingPathWidthInjuredKilled
Jul 15, 2024EF215.4 mi150 yd00
Jul 15, 2024unrated1 mi10 yd00
Mar 4, 2024unrated0.1 mi30 yd00
Mar 31, 2023EF111 mi200 yd00
May 25, 2022EF11.8 mi30 yd00
Aug 10, 2020EF04.6 mi50 yd00
Aug 16, 2017EF12.8 mi75 yd00
Aug 16, 2017EF03.3 mi20 yd00
Jul 12, 2010EF00.1 mi25 yd00
Jun 1, 2009EF00.3 mi200 yd00
Jun 14, 2003F0—50 yd00
Jun 14, 2003F00.5 mi50 yd00

Deadliest: Oct 8, 1958, F2, 1 killed.

Nearby counties

Green County, WI35Carroll County, IL21Winnebago County, IL24Ogle County, IL33Jo Daviess County, IL20Lafayette County, WI38Rock County, WI36Boone County, IL25

Questions

How many tornadoes has Stephenson County, Illinois had?

21 tornadoes touched Stephenson County, Illinois between 1950 and 2025 in the NOAA Storm Prediction Center database — about 0.3 per year.

What was the strongest tornado in Stephenson County?

The strongest rating recorded was F2 on Oct 8, 1958, with a 81-mile path and 1 deaths.

When is tornado season in Stephenson County?

Most of its tornadoes happened in June (7 of 21). 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).