The latest report from the Federal Government's Climate Commission says the weather extremes experienced around the country this summer were made worse by climate change.
The report - The Angry Summer - says the extreme heat, floods and bushfires experienced around country were all aggravated by a shifting climate, and it warns the trend is likely to continue.
If an athlete takes steroids for example... their baseline shifts, they'll do fewer slow times and many more record-breaking fast times.
The same thing is happening with our climate system, as it warms up, we're getting fewer cold days and cold events and many more record hot events.
In effect, it's a climate on steroids.
Professor Tim Flannery
Read the full report on the Climate Commission website
Climate Commission chief Professor Tim Flannery says that while Australia may have always been a land of drought and flooding rains, the nation is now experiencing a "climate on steroids".
"I think one of the best ways of thinking about it is imagining that the baseline has shifted," he said.
"If an athlete takes steroids for example... their baseline shifts, they'll do fewer slow times and many more record-breaking fast times.
"The same thing is happening with our climate system. As it warms up, we're getting fewer cold days and cold events and many more record hot events. In effect, it's a climate on steroids."
The report states that temperature records were set in every state and territory over summer.
It says much of Australia has been drier than usual since the middle of last year.
While Queensland and New South Wales have experienced heavy rainfall, Victoria and South Australia have recorded their driest summer in decades, and there have been devastating bushfires in at least three states.
Professor Will Steffen, who authored the report, says the findings are indicative of a trend that shows an increase in extreme weather events.
"Over the last 50 years, we've seen a doubling of the record hot days, we're getting twice as much record hot weather than we did in the mid-20th century, [and] we're getting less cold weather," he said.
"In fact, if you look at the last decade, we're getting three times as many record hot days as we are record cold days, so the statistics are telling us too that there's an influence on extreme events - they're shifting."