2020 Accumulated Growing Degree Days, Williamson county Illinois
January 31 = 6.5 May 10 = 354
February 29 = 11 May 20 = 471
March 31 = 116 May 30 = 686
April 10 = 187 June 10
April 20 = 200 June 20
April 30 = 274 June 30
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