For my update I've used CRUTEM3v, expecting them to be rather similar but with a few more years on the end.
But the pre-1930 temperatures are now very different, being much cooler (by > 0.5 degC for a 25-year low-pass mean) in CRUTEM3v than CRUTEM2v. Previously they had been, on average, near or even above the 1961-1990 mean, now they're at -0.5 degC.
Is this a result of some homogenization work on New Zealand summer temp data? Or just some random artefact of minor changes somewhere?
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