Source:
"The Version 6.0 global average lower tropospheric temperature (LT) anomaly for December, 2021 was +0.21 deg. C, up from the November, 2021 value of +0.08 deg. C.
The annual average anomaly for 2021 was +0.134 deg. C above the 30-year mean (1991-2020), which places it as the 8th warmest year in the 43 year satellite record, behind 2016, 2020, 1998, 2019, 2017,2010, and 2015.
The linear warming
trend since
January, 1979 remains at +0.14 C/decade
(+0.12 C/decade over
the global-averaged oceans, and
+0.18 C/decade over global-averaged
land)."