Line graph time series of slobal-mean surface temperature for September, from 1850 to 2023 using Berkeley Earth (1850-2022), ERA5 (1940-2023), GISTEMP (1880-2022), HadCRUT5 (1850-2022), JRA-3Q (1948-2022) and NOAAGlobalTemp (1850-2022). There is interannual variability and a record long-term increasing trend.
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