Yah it does seem that the most extreme summers tend to have had decent but short lived cool downs. But only to ramp right back up again to intense heat. Really if you think about it the true extreme hot summers in midwest to the east coast were 1896, 1901, 1930, 33, 34, 36, 53, 54 77, 80, 83, 88, 95, 99, 02, 07, 10, 11, and 12 to this point. The three summers in a row of 2010, 2011, and 2012 were the hottest summers I've experienced