The twin peaks in the graph of 12 month average global temperature is even more defined than it was with the addition of the April 2021 anomalies. Berkeley and HadCRUTv5 are still holding back their data for some reason, the last published by the British was their January estimates, which does make you wonder what the hold up is with their brand new way of doing things in version five? NOAA are trying to put a brave face on it all in their usual monthly ‘automated’ tweet saying that it was the ninth warmest April anomalies in their series, despite it also being the coldest since 2013, with anomalies that were 0.331°C lower than in last April. I must say that the world map they publish looks fairly damming but they are using the 1971-2000 LTA period. Of course the official reason for this cooling will be the recent La Niña event, even though the cooling started well before it was declared. It will be interesting to see just how the rest of the year pans out with neutral ENSO conditions.
Similarly, it was also the coldest April since 2013 in the NASA and GISS series with anomalies 0.39°C lower than they were in 2020.
All in all, if this graph of global temperatures continues to behave as it is, it won’t really grab the publics attention much at the COP 26 summit when it comes around in November, and ‘natural variability’ seems to be a much stronger force than AGW is in global temperatures at the moment.