
There are three GISS stations on the list, in Atlanta, Augusta and Macon. Of these Atlanta and Macon have a sensibly full temperature record from the 1880’s, while Augusta falls into the class of those with data only since 1948.

With the exception of the spike in temperatures from 1981 to 1984, the town seems to have been cooling fairly consistently. Looking at the other two stations therefore, starting with Atlanta.

And there is the similar drop in temperatures between about 1948 and 1980 and the same sort of drop off since. So check with Macon:

There is still a drop, though not as great (around 1962) and subsequent temperatures again have been trending down. So it does appear, from the GISS data that the hypothesis is correct, but with that initial eyeball of the data, it is better to run the actual numbers. Looking then at the composite picture from the three stations

Although the more recent temperatures are holding relatively steady, the averaging, while showing the dip around 1965, does not show any recent decline. Looking at the USHCN homogenized average station temperatures for the state:

The difference between the two curves can perhaps be seen by the adjustments that GISS has made to the USHCN homogenized data.

Looking at the raw data, as modified to adjust for time of observation (TOBS) the plot is a little different.

Now while this shows an overall decline in temperature over the century, it also shows a relatively steady increase in temperature since about 1970, so I am not convinced that the hypothesis has, in fact, been validated. Oh, well that’s why they call this research.
Georgia is 300 miles long and 230 miles wide, running from 81 deg W to 85 deg W, and from 30 deg N to 35 deg N. The average latitude is 32.71 deg N, that of the GISS stations is 33.24 deg N, and for the USHCN stations 32.7 deg N. Georgia rises from sea level to 1,458 m, with the mean elevation being 182.9 m. The average elevation of the GISS stations is 190 m, and for the USHCN stations 152 m.
Looking at the effect that the geography has on the station temperatures:

Looking at the correlation with longitude:

Georgia is one of the states where, as the ground rises to the west, so the average temperatures fall. The elevation explains:

The population statistics that citi-data quote are generally based on 2009 estimates, according to the sites I used, which explains why a five-year average seems to work best. There are a number of stations without full TOBS data in that period, however.

I am not sure why the temperature data didn’t follow the expected trend, perhaps when I have this initial series finished, I’ll come back and look into that in more detail.

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