"Australia is one country where you really can see the signal of global warming", Karl Braganza, the Bureau of Meteorology's head of climate monitoring, told reporters on a call. Heat and drought risk devastating crops in Australia, the world's third-largest exporter of cotton where farm production is forecast to be worth A$59 billion ($46 billion) this financial year.
Australia has experienced the first back-to-back coral bleaching event in the Great Barrier Reef after sweating through the third-warmest year on record.
This map shows the mean temperatures across Australia in 2017.
"Despite the lack of an El Niño-which is normally associated with our hottest years-2017 was still characterised by very warm temperatures", he said.
The eastern states of New South Wales and Queensland were the hardest hit, recording their hottest year ever in 2017.
Seven of the vast continent's 10 warmest years have occurred since 2005, with only 2011 cooler than average, the Bureau of Meteorology (BOM) said in its annual climate statement.
"Seven of Australia's ten warmest years have occurred since 2005 and Australia has experienced just one cooler than average year-2011-in the past decade". The mean temperature of 22.76 degrees Celsius (72.97 degrees Fahrenheit) was 0.95 of a degree Celsius (1.71 degrees Fahrenheit) hotter than the 1961-to-1990 average.
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Prolonged high sea surface temperatures linked to climate change saw significant coral bleaching on the World Heritage-listed Great Barrier Reef during early 2017.
"This is the second consecutive year of bleaching following the event of 2016 and the only instance of back-to-back summer bleaching events on record".
The warmest months of the year were March, July, August, October and December.
Daytime temperatures were the second warmest on record in 2016, according to Dr Braganza.
"That means odds favouring warmer than average temperatures more often than in the past, that's what we've seen when you look at the temperatures into the late 1980s and '90s". The South West and Perth should remain relatively dry and warm. It was the sixth-warmest in Victoria and for Tasmania, it was the equal-10th warmest.
Meanwhile, oceans around Australia recorded temperatures "well above average" for the year.