Roy W. Spencer, Ph. D.
"Steve Goddard recently posted some results from his analysis of the official U.S. surface temperatures (USHCN, from NOAA) suggesting spurious warming occurring around 1998. I also showed evidence of this back in 2012.
Steve’s post reminded me that it’s been over a year since I’ve updated the U.S.-average Integrated Surface Hourly (ISH) temperature data, using my Population Density Adjusted Temperature (PDAT) algorithm that corrects for changing urban heat island (UHI) effects. This is still an unpublished method, and so should be considered more of a sanity check on the official NOAA USHCN product. But it does support Steve’s contention that there’s something funny going on in the USHCN data."
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