Australian climate stable since 2012

Dataset shows no warming for 12 years and eight months

Comparing the first and second halves of the time period from September 2012 to April 2025, Australia's temperature anomalies have slightly cooled by 0.018C, according to the Australian Climate Observation Reference Network (ACORN 2.5) for land stations (Bureau of Meteorology data source).

The University of Alabama Huntsville satellite dataset for Australian lower troposphere anomalies (UAH 6.1) shows mean temperature warming of 0.195C when comparing the first and second halves of the period from November 2012 to March 2025 (with significant warming over Australia since 2021 as a result of UAH methodology being changed in November 2024).

In a different timeframe from January 2013 to April 2025, ACORN also shows mean temperature cooling of 0.067C and UAH shows Australian lower troposphere warming of 0.204C when averaging the first and second halves of this time period.

The ACORN dataset shows significant land surface warming since June 2023 and the UAH dataset shows significant warming of the lower troposphere since July 2023 - both potentially affected by the emergence of an El Nino in the Pacific Ocean, strong solar activity and abnormally high atmospheric moisture content due to the Hunga Tonga underwater volcanic eruption in December 2021.

Comparing 2012/13-2018/19 with 2019/20-2024/25, ACORN data show the trends are seasonal. Averaged mean temperature anomalies in Australia's cool months of April-October warmed slightly (+0.08C) and the hot months of October-April cooled significantly (-0.21C). Australia's climate became more moderate during these 12 years.

The charts below are updated each month to track anomaly trends produced by the ACORN and UAH datasets.

The chart below tracks anomaly trends within ACORN 2.5 maximum temperatures.

The chart below tracks anomaly trends within ACORN 2.5 minimum temperatures.

It is worth noting the ACORN 2.5 mean temperature anomaly averages in Australia's seven state and territory jurisdictions:

NSW/ACT : Sep 2012-Dec 2018 - 1.357C / Jan 2019-Apr 2025 - 1.073C (-0.284C)

Northern Territory : Sep 2012-Dec 2018 - 0.866C / Jan 2019-Apr 2025 - 0.941C (+0.074C)

Queensland : Sep 2012-Dec 2018 - 1.361C / Jan 2019-Apr 2025 - 1.202C (-0.159C)

South Australia : Sep 2012-Dec 2018 - 1.223C / Jan 2019-Apr 2025 - 0.985C (-0.239C)

Tasmania : Sep 2012-Dec 2018 - 0.619C / Jan 2019-Apr 2025 - 0.509C (-0.110C)

Victoria : Sep 2012-Dec 2018 - 1.015C / Jan 2019-Apr 2025 - 0.741C (-0.274C)

Western Australia : Sep 2012-Dec 2018 - 0.890C / Jan 2019-Apr 2025 - 1.120C (+0.230C)

The cumulative average of these jurisdictional anomalies equals -0.109C when comparing Sep 2012-Dec 2018 with Jan 2019-Apr 2025, warming only apparent in the Northern Territory and Western Australia.

The chart below tracks anomaly trends within the US National Oceanic and Atmospheric Administration mean temperatures (1910-2000 mean baseline) for the Oceania region (comprising Australia, Papua New Guinea, New Zealand, Fiji, Solomon Islands, Federated States Of Micronesia, Vanuatu, Samoa, Kiribati, Tonga, Marshall Islands, Palau, Tuvalu and Nauru) - noting that each month NOAA significantly changes the monthly anomalies within its dataset dating back to 1910.

These trends are worth monitoring as most Australian public policy hostile to fossil fuels and targetted at renewable energy is now based on the inaccurate premise that Australia's climate is warming rapidly, according to the official ACORN 2.5 monthly temperature anomalies published by the Bureau of Meteorology.

Note : ACORN and UAH data above are updated usually on the third or fourth day of each month, while NOAA anomalies for Oceania are usually updated in the middle of each month.

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