From the Australian Bureau of Meteorology:
October mean temperatures were unusually warm, with a national anomaly 1.43 °C above the 1961–1990 average. This means that Australia has seen 15 consecutive months of warmer-than-average temperatures, with numerous records broken as a result.Via HotWhopper.
This continuation of unusually high spring temperatures has been sufficient to break the national record for the warmest 12-month period again, the third consecutive month in which a new record has been set.
Averaged over the 12 months from November 2012 to October 2013, Australian mean temperatures were 1.30 °C above the 1961–1990 average. This surpasses the records set in the previous two months (+1.25 °C for October 2012 to September 2013 and +1.11 °C for September 2012 to August 2013) and is some 0.22 °C warmer than any 12-month period prior to 2013 (+1.08 °C for February 2005 to January 2006).