The official numbers are out from NCDC, and it turns out that the record hot June of 2012 was cooler than 1933, 1918, 1952, 1931, 1934, 1911 1936. and a number of other years.
And this was after they adjusted the temperatures upwards by more than a degree!
The hottest June in US History was 1933. Temperatures on the South Dakota/Minnesota border were 12 degrees above normal. The 1930s is what global warming looked like