Record hot days are now 12 times more likely in Australia than days of record-breaking cold, and the ratio is increasing as rising greenhouse gases trap ever more heat on the planet, according to new research.
During the first 50 years of reliable national temperature records covering 1910-1960, days of extreme heat occurred as often as days of extreme cold.
However, this ratio rose to two-to-one between 1960 and 1980 in Australia and increased to about seven-to-one for 1980-2000 before stepping up further to 12-to-one for the 2000-2014 period.
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