Data released last month showed average maximum temperatures in the winter months of June to August were nearly 2℃ above average.
According to a report released recently - Hot and Dry: Australia's Weird Winter - winter warm spells are lasting longer, occurring more frequently and becoming more intense.
More than 260 heat and low rainfall records around Australia were broken this winter, the report said.
It said climate change and the burning of fossil fuels had driven Australia's average winter temperature up by about 1C since 1910. That figure was reported by the CSIRO, the nation's scientific research body, last year.
"It is expected that the chance of warm winters like 2017 occurring will continue to increase as global temperatures rise," the report added.