NOAA’s National Centers for Environmental Information (NCEI) publishes a temperature database for 7280 worldwide meteorological stations. It is called the Global Historical Climatology Network (GHCN.) The database consists of six files, three (maximum, minimum, and average) for ‘Unadjusted’ and three for ‘Adjusted’ values. The Unadjusted was formerly called ‘Raw’ data. For this short essay only the average-value data set is under consideration. The Unadjusted is ‘as received’ data from agencies/centers from around the world that collect the respective Station data. For the United States there are six collection centers known as NOAA’s the Regional Climate Centers. Supposedly the Unadjusted data are ‘as measured’ values, but the NOAA-NCEI advises on its GHNC web page “…it is entirely possible that the source of these data (generally National Meteorological Services) may have made adjustments to...(Read Full Article)