Hottest Day of the Year in Bowling Green, KY

The hottest day of the year where I live can vary by more than three months. 

Since 1948, it's been as early as June 1 (in 1951) and as late as September 23 (in 1961). 

June 1-15: 6 times
June 16-30: 7 times
July 1-15: 14 times
July 16-31: 16 times
Aug. 1-15: 12 times
Aug. 16-31: 9 times
Sept. 1-15: 5 times
Sept. 16-30: 1 time

The average date is July 24, though it's been shifting later. The record period is 69 years, so I divided it up into three 23-year intervals.

1948-1970: July 23
1971-1993: July 22
1994-2016: July 29

The average temperature is a toasty 97.52 F / 36.40 C on the hottest day of the year, but the hottest day of 2012 (June 29) was an amazing 109 F / 43 C! 2004's hottest day, on the other hand, was just 91 F / 33 C. 

91-93 F: 10 times
94-96 F: 16 times
97-99 F: 28 times
100-102 F: 7 times
103-105 F: 4 times (all 103)
106-109 F: 4 times

There is no real trend of it getting hotter or colder over time.

1948-1970: 97.65 F
1971-1993: 97.17 F
1994-2016: 97.74 F

Bowling Green, KY data used 1948-1954, 1973-2000, 2002-present.
Nashville, TN data used 1955-1972 and 2001 due to a lack of Bowling Green data for those years.