The broad general agreement about trends in surface temperature indices is sufficient for our purposes. (judithcurry.com)
That is why HadCRUT4 is more sensitive to ENSO than other surface temperature indices, and a significant factor in why making the index truly global increases the trend significantly. (realclimate.org)
FACT: The HadCRUT3 surface temperature index shows warming to 1878, cooling to 1911, warming to 1941, cooling to 1964, warming to 1998 and cooling through 2011. (wattsupwiththat.com)