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September 25, 2024 at 4:42 PM. (This story was updated to add new information.) The remnants of Hurricane Helene are slated to hit Illinois beginning Thursday, with the possibility of heavy rains ...
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 ...
Missouri locations. St. Peters: 14.69. St. Louis: 7.79. Lambert International Airport: 9.97. Several southwest Illinois areas recorded between 5 and 8 inches of rainfall, though one locality had ...
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]
Temperature. According to a 2021 report from The Nature Conservancy, the average daytime temperature in Illinois has increased by 1 to 2 °F (0.6 to 1.2 °C) over the historical average in the last 100 years. Additionally, the nighttime minimum temperatures are rising at a faster rate than the daytime high temperatures.
Tuesday-Wednesday: Parts of Illinois and Indiana can expect 2 to 4 inches of rainfall, with higher localized amounts possible. More: Beryl has reached US as the 10th hurricane on record to make ...
The rainfall observed over the region during the period of July 25–30 was over 600 percent of normal totals. The four-day rainfall totals of 14–16 inches (360–410 mm) in some areas were reported to have a less than a 0.1 percent chance of occurring in any given year. [57]
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. [16]