Australia’s state Bureau of Meteorology accused of manipulating climate data

A report circulating online has accused Australia’s Bureau of Meteorology (BoM) of systematically altering historical temperature records in a way that transforms long-term cooling trends into warming trends, reigniting debate over the transparency of “climate data adjustments”.

The claims were highlighted by climate commentary outlet Electroverse, which said an audit of individual weather stations found significant differences between original observations and the Bureau’s adjusted temperature records.

According to the report, the Victorian weather station at Rutherglen originally showed an overall cooling trend between 1913 and 2006. However, after the Bureau’s data adjustments were applied, the published record reportedly showed a warming trend instead. The report alleges these changes were made without a clear physical explanation and instead relied on statistical “homogenisation” techniques.

The report also points to the Deniliquin weather station in New South Wales, claiming historical maximum temperatures were reduced and minimum temperatures dating back to 1910 were adjusted downward by as much as 1.8 degrees Celsius. It argues these revisions were introduced decades after the original observations were recorded through computer-based adjustment models rather than new observational evidence.

The report’s author describes the changes as a rewriting of Australia’s climate history, arguing the adjusted records no longer accurately reflect the original measurements collected at weather stations.

Electroverse further contends that similar adjustment practices have been adopted by climate agencies in other countries, including the United Kingdom and the United States, alleging that historical temperatures have been modified in ways that amplify modern warming trends.

Climate scientists and meteorological agencies generally maintain that “homogenisation” is “a standard scientific process” used worldwide to correct for non-climatic influences such as station relocations, instrument changes, altered observation times and urban development, with the aim of producing consistent long-term climate records. However, critics argue the methodology lacks sufficient transparency and can materially alter historical temperature trends.

The report has renewed calls from sceptics for greater public scrutiny of the adjustment methods used by national climate agencies and for easier access to both raw and adjusted temperature datasets.

Australia’s Bureau of Meteorology has been audited station by station. The report reveals that the agency has systematically erased cooling trends from the historical record, replacing them with synthetic warming.

At Rutherglen, Victoria for example, raw data from 1913 to 2006… pic.twitter.com/n9HroEQiqB

— Electroverse (@Electroversenet) July 8, 2026