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Mapping changes in temperature: every year from 1850 to 2023
(fediscience.org)
Red indicates a higher average temperature than the previous year; blue the opposite.
The temperatures are relative to the 1961-1990 average for that region, from the HadCRUT5 dataset.
Edit: I'm just going to find out if it's relative to the average, or just lowest value is blue, highest is red.
The footnote detailing this is maybe a little unclear.
Also by Ed Hawkins: The climate stripes