BoM is going to have some explaining to do, a book on Australian Meteorology from the 19th and early 20th Century, different by about half, of BoM’s claimed rise.
[…] Chris Gillham’s Conclusions:
Downward ACORN adjustment of historic temperature records from weather stations before 1940 adds 0.3C or 0.4C to Australia’s rate of climate warming since 1910 but the reason for the downward adjustments is unclear. […]
[…] The CSIR and Year Book temperature datasets are unadjusted records compiled by Australia’s leading scientists and weather experts in the mid 20th century and are accurate but differ from BoM records that are adjusted in both RAW and ACORN.
Their dataset timescales include the first 85 years of temperature recording at most weather stations across Australia in a network more than twice as large as ACORN, and their averages are a legitimate historic record indicating climate warming has been significantly less than calculated with adjusted data since 1910.
Update, this is funny …
Steve Kates, at Catallaxy Files describes The Thermometer Effect