A "global anomaly" refers to something unusual or abnormal that occurs worldwide or affects the entire world. It indicates a deviation from the norm on a global scale. Full definition
This explains the 0.6 C SST anomaly and the 0.8 C global anomaly. (judithcurry.com)
The December average global anomaly for GISTEMP was 0.81 °C, giving an annual anomaly of 0.99 °C relative to the 1951 - 1980 baseline. (critical-angle.net)
Rather than seeing global anomalies, many paleoclimatologists subscribe to the conclusions of Phil Jones of the University of East Anglia, Michael Mann of the University of Virginia and their colleagues, who began in 1998 to quantitatively splice together the proxy records. (scientificamerican.com)