They arbitrarily increased Australia’s per decade rate of temperature warming since 1910 by +23%.
I suppose they had predicted a lot of warming in Australia and not enough showed up ?
ACORN 2 also arbitrarily changed the number of days at 40.0C or above, defined as “very hot days”, since 1910.
The record high average number of very hot days in 1952 within ACORN 1, was reduced by -24.1% in the new ACORN 2 dataset ... although the ACORN 1 averaged total for hot 1952 is still more than the ACORN 2 averaged total for hot 2018.
The moving chart below
shows ACORN 1
very hot days
from 1910 to 2015,
then changes
to ACORN 2 (2019 revision)
very hot days
from 1910 to 2018:
