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The monthly anomaly of the global average surface temperature in May 2021 (i.e. the average of the near-surface air temperature over land and the SST) was +0.22°C above the 1991-2020 average (+0.77°C above the 20th century average), and was the 5th warmest since 1891. On a longer time scale, global average surface temperatures have risen at a rate of about 0.73°C per century.
1st. 2020,2016(+0.31°C), 3rd. 2015(+0.27°C), 4th. 2017(+0.23°C), 5th. 2021,2019(+0.22°C)