The biannual State of the Climate report from the Bureau of Meteorology and CSIRO shows the effects of climate change are being felt in Australia.
Australia is becoming an even more sunburnt country with worse droughts and more extreme flooding rains.
The latest State of the Climate report, released on Thursday, shows the trends of climate change in Australia are continuing.
"Climate change is happening now; it's having a tangible impact on Australia," the Bureau of Meteorology's climate monitoring manager Karl Braganza told reporters.
The biannual snapshot, prepared by the bureau and CSIRO, shows the country is experiencing very hot days more frequently and rainfall is reducing across the southern part of the continent.
Between 1910 and 1941 there were 28 days when the national average temperature was in the top extremes recorded.
In 2013 alone there were 28 such days.
Dr Braganza predicted the record-breaking extreme heat will be considered normal in 30 years' time.
The report also shows below average rainfall across southern Australian in 16 of the past 20 autumn-winter seasons.
"This decline in rainfall for southern Australia, 10 to 20 per cent might not sound like a lot but it's reducing at a time of year where typically we recharge the soil moisture and vegetation and water storages as well," Dr Braganza said.
A 10-15 per cent reduction in rainfall over winter can lead to a 60 per cent reduction in stream flow into water storages.
"That's what we're seeing in southwest WA where their water storages from essentially rainfall (dropped) in 2015 and they're using desal and groundwater to make up the difference," he said.
This combination of drying out and warmer weather increases fire danger, with the fire season already routinely extending into spring and autumn.
The report also shows 15 of the 16 hottest years on record were the past 15 years.
"The earth is warming," CSIRO climate science centre interim director Steve Rintoul said.
While there was some natural variability in temperature caused by effects such as El Nino and La Nina, it was not sufficient to drown out the overall trend towards increasing temperatures, he said.