In fact the surface temperature numbers consist of very little data.
By data I mean raw measurements.
Once a raw measurement is adjusted, it is no longer real data.
It is an estimate of what the data would have been if measured correctly in the first place.
Beyond the initial adjustments, are later repeated adjustments and infilling of grids with no weather stations, and any missing weather station data.
That
infilling (wild guessing) is a deep dark secret -- just try to find out
what percentage of temperature numbers in the global average
temperature statistic were guesses, not measurements.
The global average temperature compilations before the use of satellites in 1979 are not fit for scientific analysis.
Surface
coverage was insufficient and there was s too much infilling by
bureaucrats who WANT to see more global warming, with no satellite data
as a check and balance.
Surface data get increasingly worse before 1950, and are worthless before 1900.
The charts below will show the poor coverage of land surfaces.
Ocean coverage is even worse before the use of ARGO floats about 20 years ago.
