TIm Ball: Remember a few months ago, when NCDC told us that the July 1936 temperature was 77.4 degrees? They just remembered that the actual July 1936 temperature was 76.4 degrees

HARRIS AND BALL: 2012 probably not the hottest on record, after all - Washington Times

Strangely, NCDC changes temperature data even from the distant past without notification. For example, NCDC now asserts that the average temperature in July 1936 was 76.4 degrees, a full degree cooler than the 77.4 degrees that they claimed for the month in the July 2012 SOTC report. This allows them to continue to say that July 2012 set a record.