The “adjustment” schemes in the official U.S. dataset are so drastic, according to Goddard’s analysis, that they managed to “turn a 90 year cooling trend into a warming trend,” he said, suggesting that there may be a “software bug” at work. “Bottom line is that the [NOAA National Climatic Data Center] U.S. temperature record is completely broken, and meaningless,” Goddard concluded. “Adjustments that used to go flat after 1990 now go up exponentially. Adjustments which are documented as positive are implemented as negative.”

Respected climatologist and NASA scientist Dr. Roy Spencer actually showed evidence of what Goddard described as early as April of 2012, saying that “virtually all of the USHCN warming since 1973 appears to be the result of adjustments NOAA has made to the data.” Commenting on the latest findings, Dr. Spencer said that his own examination of the data and corrections to account for urban heat island (UHI) effects “support Steve’s contention that there’s something funny going on in the USHCN data.” He also called the NOAA methodology for adjusting the data “opaque” and said he believes it is prone to serious errors.