After performing a histogram on the data, here's what it revealed...
Louisville International's most common daily temperature was...(drum roll please)...64 degrees.
Here is a list of the top 5:
64 degrees 21x
68 degrees 19x
34 degrees 18x
70 degrees 17x
73 degrees 17x
The mean or average temperature for 2013 was 57.5 degrees and a standard deviation of 20.4 degrees.
The maximum temperature was 96 and the minimum was 9.
Below is a summary of the statistical data...notice the 'Mode' shows 64, which is the most common temperature reported for last year. - MS