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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 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 yearly precipitation for Illinois varies from just over 48 in (1,219 mm) at the southern tip to around 35 in (889 mm) in the northern portion of the state. Normal annual snowfall exceeds 38 in (965 mm) in the Chicago area, while the southern portion of the state normally receives less than 14 in (356 mm). [68]
During El Niño events, precipitation averages about 10 percent above normal, while La Niña events lead to precipitation amounts which average close to 10 percent below normal. [79] Pago Pago harbor in American Samoa has the highest annual rainfall of any harbor in the world. [80] This is due to the nearby Rainmaker Mountain. [80]
Of the 7,720 households, 32.6% had children under the age of 18 living with them, 57.0% were married couples living together, 8.5% had a female householder with no husband present, 30.3% were non-families, and 26.1% of all households were made up of individuals. The average household size was 2.57 and the average family size was 3.11.
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 ...
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 ...
Charles Mound, the highest natural point in Illinois at 1,235 ft (376 m), is located near Scales Mound in Jo Daviess County. According to the U.S. Census Bureau, the county has a total area of 619 square miles (1,600 km 2), of which 601 square miles (1,560 km 2) is land and 18 square miles (47 km 2) (2.9%) is water. [10]