He is known to fudge data!

" Some such details are provided in Centre for Australian Weather and Climate Research (CAWCR) technical reports (e.g. use of 40 best-correlated sites for adjustments, thresholds for adjustment, and so on); however, the Forum
concluded that it is likely to remain the case that several choices within the adjustment process remain a matter of expert judgment and appropriate disciplinary knowledge."

If it can't be replicated it can't be science. Expert judgment is not replicable.

"Reason for adjustment Maximum temperature Minimum temperature
Statistical                             209                                   244
Site moves (all)                    176                                   170
Screen change or condition   79                                     77
Site condition (without move)   9                                       5
Observation time change         2                                     24
Total                                     450                                    491
Table 7 ACORN-SAT version 2 adjustments by cause. Totals do not add as some adjustments have multiple causes. "

http://www.bom.gov.au/climate/change/acorn-sat/documents/BRR-032.pdf

Statistics can't tell us what the temperature was at a site yesterday, let alone on a day 100 years ago.