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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 ]
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]
More frequent heavy precipitation events are a predicted outcome of climate change. [6] Historically, average snowfall ranges from about 10 inches (25.4 cm) in southern Illinois to 40 inches (100 cm) in northern Illinois. The change in annual snowfall amounts show no trends at all, with years being higher or lower than average.
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 ...
November 24, 2023 at 12:55 PM ... Winds could gust as high as 21 mph. Chance of precipitation is 70%. New snow accumulation of less than a half inch possible. ... Peoria weather: Central Illinois ...
The storm left a mark on Illinois, Indiana, and Ohio, which received heavy snow for over 24 hours, accumulating upwards of 18 inches (460 mm) in some areas. Many parts of Northern and Northeastern Indiana received between 12 and 20 inches (300 and 510 mm), and blizzard conditions for an extended period of time.
The Old Farmer's Almanac divides Illinois into three different regions, all of which have very different winter forecasts.
Weather stations with highest snowfall in the United States by state, 1985-2015; State Place Average annual snowfall [3] elevation of weather station [4] coordinates [4] Other snowy areas (limited or unofficial data) and notes 1. Washington: Paradise, Mount Rainier: 645.5 inches (1,640 cm) 5,400 feet (1,600 m)
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