Illinois Weather Trivia for November 21st
- Central Illinois averages about 20 days a year where dense fog reduces visibility to 1/4 mile or less. However, the foggiest areas of the country are in the far western U.S., in mountain valleys and along the coast, in the Appalachian Mountains of the eastern U.S., and in southwestern New England. These areas usually see at least 80 days a year with dense fog.
Select Other Dates for Illinois Weather Trivia