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280 if 70% or more of the total precipitation is in the high-sun half of the year (April through September in the Northern Hemisphere, or October through March in the Southern), or; 140 if 30%–70% of the total precipitation is received during the applicable period, or; 0 if less than 30% of the total precipitation is so received.
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]
The Milwaukee area saw rain totals at about a half inch on Nov. 8, 2023. ... But Wisconsinites in the Green Bay area saw the most rain yesterday at about three quarters of an inch.
St. Peters: 12.86. St. Louis: 7.79. Lambert International Airport: 8.63 Tuesday, storm total 9.06. Rainfall totals varied immensely across the area. While some locations were shattering records ...
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 ...
Harvey's storm total rainfall is the most recorded within the United States. [ 119 ] [ 120 ] Harvey's extremely heavy rainfall produced catastrophic flooding across much of southeastern Texas; particularly in and around the Houston metropolitan area , where accumulations exceeded 40 in (1,000 mm) over a four-day period. [ 119 ]
San Diego on average has 146 sunny days and 117 partly cloudy days a year. The average annual precipitation is less than 12 inches (30 cm), resulting in a borderline arid climate. Rainfall is strongly concentrated in the cooler half of the year, particularly the months December through March, although precipitation is lower than any other part ...
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