Extended Data Fig. 3: Early instrumental temperature offset.
From: 2023 summer warmth unparalleled over the past 2,000 years
Comparison of Berkeley Earth 30–90°N JJA land only observational temperatures20 with ensemble mean reconstructed JJA temperatures23 since 1850 CE. Bold horizontal lines emphasize the 1850–1900 CE offset of 0.24 °C between the two records. The reconstruction was scaled against the observations from 1901–2010 CE and both timeseries then displayed as anomalies with respect to the 1850–1900 CE reconstruction mean.