Readers were kind enough to point to the newest revision of global temperature data from the Hadley Centre/Climate Research Unit in the U.K., the HadCRUT5 data (a revision of the HadCRUT4) data.
The HadCRUT4 data were in disagreement with the other surface temperature data sets, namely those from NASA, Berkeley Earth, and NOAA. But the new HadCRUT5 data set agrees with them excellently: