Hansen tells us that heatwaves are much worse now because of evil humans, so we know that the 1923-1924 record heatwave in Australia was impossible.
Marble Bar heatwave, 1923-24
The world record for the longest sequence of days above 100°Fahrenheit (or 37.8° on the Celsius scale) is held by Marble Bar in the inland Pilbara district of Western Australia. The temperature, measured under standard exposure conditions, reached or exceeded the century mark every day from 31 October 1923 to 7 April 1924, a total of 160 days.
The highest temperature recorded during the record spell was 47.5°C on 18 January 1924. There have been higher temperatures at Marble Bar, with the highest recorded being 49.2°C, on 11 January 1905 and again on 3 January 1922. But temperatures in other Western Australian towns have been higher: in a remarkable late-season heat-wave in February 1998, Mardie recorded a maximum of 50.5°C (on the 19th) – the highest temperature in Western Australia, and the second highest ever recorded in Australia using standard instrumentation (Oodnadatta, in South Australia, recorded 50.7°C on 2 January 1960). Several other recordings above 49°C were reported in the northwest on the days preceding Mardie’s record, and at Nyang, the average maximum over the entire summer exceeded 43°C. As in 1923-24, very dry conditions accompanied the extreme heat.
BOM – Australian Climate Extremes