Freezing Fog in Illinois
Every freezing fog event the National Weather Service has filed in Illinois, year by year, with the most significant episodes. Fog that froze on contact with roads, vehicles or structures.
The most significant on the map
The most significant freezing fog episodes in Illinois.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The record
- Events
- 41
- Deaths
- 0
- Injuries
- 0
- Damage
- None recorded
Every year
The most significant
Ranked by deaths, injuries, damage and size together.
- Freezing Fog in Illinois, December 22, 2009Freezing fog developed on the back side of a high pressure ridge over the Upper Ohio Valley. The freezing fog was dense south and east of a line from Marion to Mount Carmel. Visibility in those areas was one-quarter mile or less.
- Freezing Fog in Illinois, January 18 to 19, 2010Dense freezing fog occurred over parts of southern Illinois as a result of high pressure extending from the upper Mississippi Valley to the central Gulf coast. Light winds, high humidity, and areas of clear sky associated with this high caused dense fog to form.
- Freezing Fog in Illinois, January 18, 2010Dense freezing fog occurred over parts of southern Illinois as a result of high pressure over the Lower Ohio and Mid Mississippi Valleys. Light winds, high humidity, and areas of clear sky associated with this high caused dense fog to form.
- Freezing Fog in Illinois, December 21, 2009With cold air in place and sufficient moisture content in the lowest levels of the atmosphere, freezing fog developed along the Ohio River in southernmost Illinois. Several accidents were reported on the Interstate 24 bridge crossing the Ohio River. The Ohio River bridge on U.S.
- Freezing Fog in Illinois, January 10 to 11, 2014Abundant low level moisture and weak winds ahead of a weak storm system lifting northeastward out of Missouri produced widespread fog and drizzle across northwest Illinois. North of U.S.
- Freezing Fog in Illinois, January 9, 2025Calming winds and clearing skies allowed for freezing fog development in far northern portions of Southern Illinois near the I-64 corridor.
- Freezing Fog in Illinois, December 4 to 5, 2023Widespread dense freezing fog reduced visibility to one-quarter mile or less in the southernmost portions of Illinois near the Ohio/Mississippi River confluence. Fog development occurred in an area of clear skies and calm winds ahead of a cold frontal passage.
- Freezing Fog in Illinois, January 11, 2025Localized freezing fog developed during the evening hours of the 11th in portions of Southeastern Illinois which had calm winds and plunging temperatures. Visibility lowered to a quarter mile at Harrisburg-Raleigh Airport.
More
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.