What is the average Elusive Absolute Surface Air Temperature. Well the computer models taking data from the base period 1951-1980 it is 14.0 degrees Celsius.

Yes a computer model. Not a direct measurement of the Temperature. A great deal of heat island effects have occurred since then. Lots of poured concrete surrounding the same temperature sensors making the same measurements since then.

You may have a theory of global warming let alone industrial human causation, but don't assume you have the data (i.e. what was the temperature record for the last 150 years 238 km directly east of the south pole or 1456 km east of Perth Australia) measured using very limited sample sites in environments (mostly in the Northern Hemisphere) that have been changing (micro climates).

Remember that we are looking for changes in fractions of 1 degree Celsius. Measurement of temperature is extremely difficult as even micro bolometers have difficulty measuring with accuracies less than 0.1 degree Celsius.