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Climate of Illinois : ウィキペディア英語版 | Climate of Illinois
The Climate of Illinois describes the weather conditions, and extremes, noted within the state of Illinois, USA, over time. Because of its nearly length and mid-continental placement, Illinois has a widely varying climate. Most of Illinois has a humid continental climate (Köppen climate classification ''Dfa'') with hot, humid summers and cool to cold winters. The southernmost part of the state, from about Carbondale southward, borders on a humid subtropical climate (Köppen ''Cfa'') with more moderate winters. Average yearly precipitation for Illinois varies from just over at the southern tip to in the northern portion of the state. Normal annual snowfall exceeds in Chicago, while the southern portion of the state normally receives less than .〔(Illinois State Climatologist Office ). (Climate Maps for Illinois ). Accessed April 22, 2006.〕 The highest temperature recorded in Illinois was 117 °F (47 °C), recorded on July 14, 1954, at East St. Louis, while the lowest temperature was -37 °F (-39 °C), recorded on January 15, 2009, at Rochelle. Illinois averages around 50 days of thunderstorm activity a year which put it somewhat above average for number of thunderstorm days for the United States. Illinois is vulnerable to tornadoes with an average of 35 occurring annually, which puts much of the state at around 5 tornadoes per annually.〔"(Annual average number of tornadoes, 1953-2004 )", NOAA National Climatic Data Center. Retrieved on October 24, 2006.〕 The deadliest tornado on record in the nation occurred largely in Illinois. The Tri-State Tornado of 1925 killed 695 people in three states; 613 of the victims lived in Illinois. ==Temperatures== Due to the urban heat island effect, cities tend to be 2 °F (1 °C) warmer on average, which is most noticeable overnight.〔Illinois State Water Survey. (Climate of Illinois. ) Retrieved on 2008-03-19.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Climate of Illinois」の詳細全文を読む
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