In January, 1858 Adelaide had nine consecutive days over 100F, topping out at 116.3.
The graph below compares that to the “record heatwave” during the last nine days in Adelaide. The 1858 heatwave averaged 11 degrees warmer, with every day of the heatwave hotter than the corresponding day this year. CO2 was 280 PPM at the time.
h/t to Ivan for finding the 1858 information