Slide 1 in this series.
The measurement of temperature as an anomaly is an important element in comprehending the claims for warming and by how much. You can see that the actual temperature readings have an average value subtracted from each reading to arrive at an anomaly temperature.
Think of an average body temperature as indicative of something. Hard to imagine that this will be of much use, but there is some value in understanding an average as long as other questions are asked.
NEXT: Given this method of measuring the entire globe and reporting it an average anomaly, accuracy is the question we begin with. We can begin with examining the average monthly USA land temperature readings.
A full range of topics on how global temperature works, is reported, adjusted, and some insignts into its accuracy.