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A large number of factors affect the consistency of the temperature record over time.
The history of instrumental weather observations in Australia stretches back to European settlement.
Unfortunately for modern-day scientists, there was no common standard for observing equipment during the colonial period.
Any number of instrument configurations were used, including—perhaps iconically—thermometers housed in beer crates on outback verandas.
For this reason, a carefully prepared dataset such as ACORN-SAT is vital for climate research.
While considerable effort is made to keep observational practices consistent—and to keep a careful log of changes at each site—each change in methodology or technology can leave its mark on the record.