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The driest month on record has been September 1979 with a mere 0.01 in (0.25 mm) of rainfall, while the wettest is August 1987 with 17.10 in (434 mm) of rainfall; annual precipitation has ranged from 22.22 in (564 mm) in 1962 to 50.86 in (1,292 mm) in 2008.
Average monthly precipitation (in mm) for selected cities in North America City Country Year Jan Feb Mar Apr May ... Chicago: United States: 1,038.0 58.0 54.0 68.0 ...
Average yearly precipitation for Illinois varies from 48 inches or 1,220 mm at the southern tip to 35 inches or 890 mm in the northern portion of the state. Normal annual snowfall exceeds 38 inches or 0.97 m in Chicago , while the southern portion of the state normally receives less than 14 inches or 0.36 m. [ 1 ]
Winter precipitation tends to be more snow than rain. Chicago's snowiest winter on record was that of 1978–79, with 89.7 inches (227.8 cm) of snow in total. The winter of 2007–08, with more than 61 inches (155 cm) of snow, was the snowiest in nearly three decades, and the winter of 2008/2009 produced just over 50 inches (127 cm).
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
Over the contiguous United States, total annual precipitation increased at an average rate of 6.1 percent per century since 1900, with the greatest increases within the East North Central climate region (11.6 percent per century) and the South (11.1 percent). Hawaii was the only region to show a decrease (−9.25 percent). [89]
Southern Wisconsin experienced heavier rainfall in late October. Here are the rain totals in Milwaukee, Madison.
Several southwest Illinois areas recorded between 5 and 8 inches of rainfall, though one locality had more than 9 inches. Here’s what the National Weather Service St. Louis reported Wednesday ...