1 Most days ever recorded when temperature was over 100F: 33 times in 1955 at Evansville. 2  Maximum snow fall ever recorded: Jan 26, 1978, Up to 20 inches of snow fell in the central and south with 40 inches up in the north.3  A federal state of emergency was declared because of the worst blizzard on record to hit Indiana.our distinct seasons. 1  Average annual rainfall: 40 inches. 2  Average summer temperature: 70 to 80F. 3  Average winter temperature: 25 to 35F. 4  Average First Freeze Date: October 16. 5  Average Last Freeze Date: April 22.