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I know that the overall temperature is not affected by the urban heat island effect. I am saying it is impossible to properly correct the meteorological station readings to use and get a global temperature.
And if a "global temperature" were the goal I'm sure you'd have a point. But in the real world of climate science the key factor is the temperature anomaly or the difference in temperature compared to a baseline.
It is actually much easier in many cases to measure DIFFERENCES than it is to measure a single value! That's the glory of elementary school mathematics.