Extended Data Fig. 1: Instrumental temperature records.
From: 2023 summer warmth unparalleled over the past 2,000 years
a, Comparison of 30–90°N JJA land only temperatures from Berkeley Earth extending back to 1850 CE (red)20, CRUTEM5 back to 1878 CE (blue)21 and GISTEMP4 back to 1883 CE (grey)22. b, Frequency distributions of the three observational records. All data shown as anomalies with respect to 1883–1912 CE means.