Firstly, what is the best estimate of the global mean surface air temperature anomaly? (realclimate.org)
However, more station data became available; also, ocean data became available whose anomalies were used to estimate surface air temperature anomalies over the oceans. (data.giss.nasa.gov)
Surface air temperature anomaly for 2017 relative to the annual average for the period 1981 - 2010. (climate.copernicus.eu)