Avg
Min
Max
Range
January 7.55 -6.0 24.5 30.5
February 7.86 -9.3 24.5 33.8
March 8.42 -11.5 24.5 36.0
April 13.51 1.6 24.5 22.9
May 17.33 7.8 27.1 19.3
June 19.20 8.2 33.8 25.6
July 20.33 8.2 34.1 25.9
August 21.25 8.2 34.7 26.5
September 17.65 6.7 32.6 25.9
October 14.61 2.7 29.9 27.2
November 9.47 1.3 17.8 16.5
December 6.24 -3.6 17.7 21.3