A new empirical study of Australia’s minimum temperature climate regime since the start of records at 1910 reveals a two stage history: a cooling or neutral temperature stage, followed abruptly at circa 1955 by linear heating to the present at a transcontinental mean of 2.4 degrees per century (DPC). This history is consistent in Australia’s suite of over one hundred internationally-accredited highest-quality ACORN-SAT weather stations. A significant proportion of Australia is heating at over 3 DPC.
The study has a larger outcome: it reveals a new reality in the global and two hemispheric heating graphs. Their heating history, from their still-valid startdate of circa 1917, is segmented, into several consecutive events. In contrast, their mean “linear regression line” to the present is artificial, does not represent a discrete single event, and its mean value (nominated by IPCC and others as 1-1.1 DPC) is relatively meaningless.
Each of the planetary-scale climate regimes contains a significant cooling event in the middle of the 20th century. This “V curve” topology inherently delivers a mean artificial heating rate under the “linear regression” alluded to above (“1-1.1 DPC”) which is substantially lower than its component real heating event(s). The current real heating rate in each regime is manifest only in the last segment of each graph, which is inherently steeper – faster – than the “mean” heating rate. Segmented linear analysis of the global, hemispheric, and Australian heating graphs reveals the following current mean temperature heating rates: global 2.1 DPC, northern hemisphere 2.6 DPC, southern hemisphere 0.93 DPC, and Australia 1.6 DPC (mean temperature) and 2.4 DPC (minimum temperature}.
The world is heating at a rate substantially faster than the mantra rate of 1-1.1 DPC, which needs to be discarded.