Illinois

Storm History: Johnson County, Illinois

680 episodes, 719 events since 1957

Every storm the National Weather Service has filed in Johnson County, Illinois: floods, hail, damaging wind, tornadoes, winter storms, heat and the rest, with the most serious on record. Events filed by forecast zone count for every county the zone covers.

The record

Events
719
Deaths
1
Injuries
24
Damage
$25 million
Episodes
680

Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.

Open the live radar over Johnson County

Every year

From 1996 the record holds 48 kinds of event with each office’s narrative; before that, tornadoes, hail and thunderstorm wind only, and before 1955 tornadoes alone.

By kind of event

Counted under the kind that heads each episode.

Kind of eventEventsDeathsInjuriesDamage
Dense Fog10700
Hail10104$7.5 million
Tornado56014$6.2 million
Frost/Freeze5300$3.0 million
Winter Weather5200
Heat5100
Thunderstorm Wind5003$440,000
Strong Wind5000$49,000
Winter Storm3800$1.1 million
Excessive Heat3500
Drought3200$3.5 million
Flash Flood2100$173,000
Cold/Wind Chill1800
Heavy Snow1800
High Wind1000$1.5 million
Flood1013$1.8 million
Ice Storm600$25,000
Extreme Cold/Wind Chill400
Heavy Rain300
Freezing Fog200
Funnel Cloud100
Dust Storm100$1,000

The deadliest

The costliest

Damage within this county, in the dollars of its year.

The largest hail

The largest stone in each episode, which may have fallen in a neighboring county of the same episode.

The strongest tornadoes

Every tornado in Johnson County, with its track

Every episode, newest first

Earlier years, state by state:

More

Tornadoes in Johnson CountyEvery warning in Johnson County since 1986Every county in Illinois

Sources

NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24.