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Byron Shire
August 18, 2022

Extreme fire weather days in Australia have doubled

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With La Niña still playing tricks on us, it might be hard to believe that extreme fire weather days in Australia have doubled, yet according to new research from an international team of scientists, including the CSIRO, extreme fire weather days have increased in Australia by 56 per cent over the last four decades.

The results of the report show that the fire season length across Australia has increased by 27 additional days over the last 41 years (1979-2019).

CSIRO researcher, Dr Pep Canadell, said an increase in fire weather trends translated to an increase in the number of Australian bushfires.  ‘Australia has always experienced extreme bushfires, but the Black Summer of 2019/2020 highlighted an increasing trend in fire activity,’ said Dr Canadell.

‘These new findings show that the whole of Australia has seen an increase in extreme fire weather events and extreme fire days over the last four decades.’

While the Australian fire season has increased by 20 per cent over the last 40 years, globally, the average increase was found to be 27 per cent. The frequency of days with extreme fire weather globally averaged a 54 per cent increase over the same 40-year period, compared to Australia’s increase of 56 per cent.

Increase in length of fire season

The length of the fire season increases has been particularly pronounced in western North America, Amazonia and the Mediterranean.

Dr Canadell said fire weather has risen significantly in most regions around the world since the 1980s, primarily due to the impacts of climate change. ‘Australia’s highly variable fire weather conditions contribute to annual variability in fire activity, however, we are seeing over time a clear increase in the fire season and fire weather trend. Long-term climate change is driving the increasing trends.

The importance of understanding trends

‘Our study demonstrates the importance of understanding how trends in fire weather can help first responders, policymakers, and the community better prepare for, and respond to bushfires. It also highlights the importance of curbing global carbon emissions.’

Under future climate change scenarios, an increase in global mean temperatures from 1.5C to 4C by 2100 could result in the fire season length extending from 11 to 36 additional days (11 per cent to 37 per cent) compared to current conditions.

The article, published in the journal Reviews of Geophysics, involved scientists from UEA, Swansea University, the University of Exeter and Met Office in the UK and builds on research released in November last year that combined analysis of previous forest fire sites with eight drivers of fire activity including climate, fuel accumulation, ignition and management (prescribed burning).    

CSIRO has a long history of bushfire research delivering science and technologies to reduce the impact of fire on Australia’s people, environment and economy as well as informing long-term planning to build the social, economic and environmental resilience.

This research received funding from the Australian National Environmental Science Program – Climate Systems Hub.

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  1. Went and had a read. They don’t seem to take into account the growing population spreading out into forest areas that were uninhabited 40 years ago, nor the research done by their CSIRO colleagues showing that all the plants on Earth are growing much faster now with the increased CO2. Even the deserts are turning green, and so fuel is building up much faster than before, and more humans means more burning events. This is something to celebrate as most native plants require fire to flourish and spread.

  2. Christian is accurate that there is increased CO2 uptake by plants, which has increased their woody substance, but that comes at a cost to wildlife as they are more fibrous and less nutritious. But there is nothing to celebrate, at a 4 degree temp rise, many plants will start dying from heat, including our foods of fruits and vegetables, agricultural land will turn from good to marginal to bad, vegetation will be wiped out by increased intensity and duration of bush fires, droughts, floods and storms ( and take many lives), which if there is several consecrative bad food production seasons in both the north and southern hemispheres will cause global famines, while our coastline also recedes, taking all coastal development with it as the 4 degree temps associated rule of thumb of an 8 metre rise in sea level slowly comes into place. Byron Bay Bruns etc are developed from 2.5 metres above sea level, and will unavoidably be lost to the sea level rise from about a 1.5 degree temp rise – we join the increasingly sea inundated Pacific Nations


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