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Illinois averages around 50 days of thunderstorm activity a year which put it somewhat above average for number of thunderstorm days for the United States. Illinois is vulnerable to tornadoes with an average of 54 occurring annually, which puts much of the state at around 9.7 tornadoes per 10,000 square miles (30,000 km 2) annually.
The greatest amount of precipitation that fell in a 24-hour period was 9.35 in (237.5 mm) on August 13–14, 1987. That event also set the records for heaviest 6 and 12 hour rainfall amounts and contributed to August 1987's record rainfall. The heaviest calendar day snowfall was 18.6 in (47.2 cm), again at O'Hare, on January 2, 1999. [18]
Illinois has seen a 10-20% increase in annual precipitation over historical averages in the last 100 years. This precipitation increase is happening most in the Fall. [ 5 ] Additionally, there has been a 40% increase in the number of days with precipitation of 2 inches (5 cm) or more.
Related: Here's what the Old Farmer's Almanac predicts for fall weather in Illinois this year In this Feb. 2, 2011 file photo, a snow plow clears a residential area in north Peoria. Eastern ...
The United States saw its third 1-in-1,000-year rain in a week on Monday night and Tuesday morning, as southern Illinois was drenched by 8 to 12 inches of rain in 12 hours.
Highest temperature during rain ... Least per year (locale): 0.2 millimetres ... Illinois, Indiana, United States, 18 March 1925. [214]
Average monthly precipitation (in mm) for selected cities in Asia ; City Country Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ref. Mawsynram: India: 133.0 8.3 15.7 27.4 29.8 26.0 5.7
Here are rainfall amounts, in inches, from the last 24 hours (unless otherwise noted) by locality, according to National Weather Service St. Louis: Illinois locations. Belleville: 6.23, 6.33 ...