Some time ago I down loaded the complete worldwide temperature files from the Goddard Institute of Space Studies (GISS). The file format is ASCII, 80 characters per line, which means the file started out on IBM punch cards, which makes it OLD, and was later moved to a disc file. The records go back to 1700. In 1700 there are only 7 stations reporting. The number of reporting stations grows over the years, reaching 100,000 by 1979.
In 1980 the great purge was started, and by 1983 the number of reporting stations was down to 30,000, two thirds of the reporting stations had been thrown away. NASA has never offered an explanation for the great purge.
Had a warmist (and NASA is full of warmists) done the purging, by dumping stations with colder than average readings he could easily create Mann's "hockey stick" warming trend.
For that matter, NASA never explained their "corrections". The GISS site offered two files, one of raw temperature readings and one of "corrected" temperature readings. The raw file plotted out in a convincing manner, a smooth curve, no spikes or jumps. The "corrected" file would not plot properly. Just looking at the plot you could see hops, jumps, skips, spikes, and stretches of pure random trash. All the data before 1860 was total trash. Perhaps a bug in NASA's correction program?
There can be tremendous various between stations just a few miles apart. At my place in Mittersill, temperatures run 5 degrees F warmer in winter, and 5F cooler in summer than they do at Mac's Market, which is only 4 miles away.
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