[sumy23]

What is the delta-T in the graphs? I took that to mean delta from the average temperature, but then some of the graphs don't make sense. For instance, the fitted line for delta-T in the Stockholm data is entirely < 0, which wouldn't make sense if 0 represented the average temperature.

[fullshark]

"The global median temperature (of the entire dataset) is uniformly subtracted from every data point, to keep things relative to an arbitrary x-axis of 0."