Unprecedented bush fires burning in NSW, page-6

Just one example found with a quick google

"1968: 1 November to 1 December – Fires burned for a month in and around Sydney, the Blue Mountains and the Illawarra region of NSW. The fire claimed the lives of 14 people, the highest recorded in a bushfire in NSW history. It also destroyed 200 buildings of which at least 150 were homes. Over a million hectares was burned (EMA 2006b)"

https://aic.gov.au/sites/default/files/publications/tbp/downloads/tbp027_02_nsw.pdf

Use the search function in that document to find fires in November.  This is far from unprecedented.