Illinois Weather Trivia for October 20th

10/20/2010
Indian Summer is defined as a mid to late autumn period of abnormally warm weather. For a late-season warm spell to really be considered "Indian Summer", it should follow at least one killing frost, and preferably a substantial period of chilly weather. Traditional Indian Summer weather is characterized by sunny, calm, mild days and clear, cool nights, with haze or smoke in the air.

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  • Page last modified: 13-Sep-2010 5:47 PM UTC