How Wild Is October for S&P 500 Index ?

Lets define wildness , by looking at the monthly range , calculated as ( high-low)*100/average(high:low) ,  nothing but range% of the month .
Below the table with average range % for each month since 1950 , No wonder October ranks first

let’s do , further research , by looking at each calendar year, and see which month posted the highest monthly range for that year .

#FYI- the highest monthly range for the year 2013 , as of now stands at 6.48% , recorded in the May-2013.
below the table with the details of each month and the number of times it recorded the highest monthly range for a year.

That October recorded the highest monthly average for 12 year out of the last 62 years , tells how wild October was in the past .
Below the details October Months, when it recorded the highest monthly range of the year

Source: PastStat
ps: Oct-78, and Oct-79 had #shutdown
pps:  just because October might print the highest range of the year doesn’t mean it could go down , there are two possibilities .
Oct-87 ( -21.76%) vs Oct-74 ( 16.3%)
or
Oct-08(- 16.94%)  vs Oct-11 ( 10.77%)