Line graph time series showing the global temperature anomalies for every September to November period from 1979 to 2023. There is interannual variability but a clear long-term increasing trend. 2023 is an outlier and the warmest on record in this time series. Anomalies are computed relative to a 1981-2010 baseline, and all data is from ERA5 reanalysis.
https://fediscience.org/system/media_attachments/files/111/557/932/360/062/626/original/9790bf9a389686ce.png