A new report finds record fossil fuel pollution is overpowering natural cooling cycles, plunging communities from one disaster to the next with barely a breath between.
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In the space of ten days last January, communities along Victoria's Great Ocean Road lived through catastrophic fire weather warnings, watched cars wash out to sea in flash floods, and then braced again for returning extreme heat.
It was not a fluke. It was the new rhythm of the Australian summer.
A report released this week by the Climate Council documents the arc of that season in troubling detail. Titled Breakneck Speed: Summer of Climate Whiplash, the report charts the back-to-back disasters that struck between December 2025 and February 2026, and sets out the science that links them to rising greenhouse gas concentrations from burning coal, oil and gas.1
The picture it draws is one of a country whose disaster management systems, insurance markets and local government budgets are absorbing punishments that once came once a generation but now arrive in clusters, sometimes within days of each other.
A Season Unlike Any Other
The 2025-26 summer did not arrive with the signature of a dangerous El Niño, the Pacific Ocean warming pattern associated with drier, hotter conditions across much of Australia. Conditions were actually the reverse. Australia moved through the summer in a La Niña pattern, which typically brings cooler temperatures and wetter weather to large parts of the continent.
Yet the summer still delivered the fourth-hottest year on record for Australia and the globe's third-hottest year on record.2 For climate scientists, that apparent contradiction carries a pointed message.
“Climate change is now firmly behind the steering wheel of Australia's temperatures,” said Adjunct Professor Andrew Watkins, a Climate Councillor and meteorologist. “In fact 2025 started and ended in La Niña, which usually cools large parts of Australia, yet this was our fourth hottest year on record. That tells us the baseline has shifted.”
The mechanism is straightforward, though its consequences are not. Rising concentrations of carbon dioxide and other greenhouse gases trap more heat in the atmosphere and oceans. That underlying warmth is now powerful enough to overwhelm natural cooling cycles that once reliably moderated Australian summers. What a La Niña could subtract, decades of fossil fuel pollution have more than added back.2
Records That Should Not Have Fallen
The summer's temperature records were not marginal. They were historic.
On 27 January 2026, Walpeup and Hopetoun in Victoria recorded a new state high of 48.9°C, surpassing the previous record set at Hopetoun on Black Saturday in 2009. Almost one third of Victoria recorded its highest January temperature ever on that single day.3
In South Australia, the small outback town of Marree, near Kati Thanda-Lake Eyre, endured five consecutive days above 48°C. On one of those days, the thermometer reached 49.8°C. On the outskirts of Port Augusta, the mercury touched 50°C on 30 January, making it the most southerly place on Earth ever to reach that threshold.
Melbourne reached 42.9°C during the season. The city has now recorded eleven days at or above 42.9°C since the year 2000. It recorded the same number across the entire century from 1900 to 1999.4 In Mildura, 45°C was reached only six times between 1946 and 1999. Since 2000, the town has exceeded that mark a further 27 times in just 26 years.
In the Northern Territory, Alice Springs recorded more than 30 summer days above 40°C, almost twice its historical average of 17, before intense rainfall triggered dangerous flash flooding on 12 February.
The Physics of Whiplash
The whiplash pattern, where extreme heat is followed rapidly by extreme rainfall and flooding, is not coincidental. It follows directly from the physics of a warmer atmosphere.
“Our hotter oceans and atmosphere also mean more water evaporates into the sky than ever before,” Professor Watkins explained. “With more moisture in the atmosphere, storms produce more rain.”
Some towns in western Queensland recorded their average annual rainfall within the first five weeks of 2026. A tropical low in February then triggered flood watches across nearly half the continent.1 Communities that had been cut off by smoke and heat in January found their roads submerged under floodwaters a month later.
Dr Linden Ashcroft, a Climate Council research fellow and senior lecturer at the University of Melbourne, points to shifts in atmospheric circulation as a further driver. Global warming is altering the temperature difference between the tropics and the poles, destabilising the jet streams and pressure systems that once kept Australian seasons more predictable.
“We've got more energy in our earth system than at any other time in human history,” Dr Ashcroft said, “and that means these events are packing more punch.”
The heatwaves this summer also broke from historical patterns in a second respect. Record temperatures in the south-east were not driven by hot northerly winds blowing off the desert interior, as has historically been the case. They arose from atmospheric conditions that were, in the assessment of climate scientists, reshaping themselves in real time.
Two Case Studies in Rapid Disaster
The Great Ocean Road communities in Victoria lived through perhaps the most compressed version of the whiplash cycle. Fire warnings one week, flood waters the next, then heat again. The speed of the transition left little room for recovery, for insurance assessors to complete their work, for damaged roads to be cleared, or for residents to weigh whether to rebuild.
The second case is both more remote and more economically critical. The Eyre Highway stretches across the Nullarbor Plain and is the sole land link between Perth and Australia's eastern states. During the 2025-26 summer, the highway closed because of fires burning in 45°C heat. Two days later, floodwaters cut it again.1
The economic consequence of losing that route, even briefly, ripples through freight costs, fuel prices and the supply of goods to and from Western Australia. It is a pointed illustration of how climate whiplash reaches beyond the communities directly struck by fire or flood. It enters supply chains, business continuity plans and infrastructure stress assessments.
In South Australia, Marree's ordeal extended over weeks. After five days above 48°C, a two-day rainfall event dumped ten times the town's normal February monthly rainfall. A fortnight later, eight consecutive days of rain cut all roads into the town. For a community that depends on those roads for food, medical supplies and commerce, the compound isolation was more than meteorological discomfort. It was a test of basic resilience.3
The Fire Season Rewritten
Greg Mullins, a former NSW Fire Commissioner and Climate Councillor, has spent his career measuring the boundaries of what fire services can manage. His assessment is unambiguous.
“We used to think of catastrophic fire conditions as once-in-a-generation events,” Mr Mullins said. “Now they're arriving every decade. The climate baseline has shifted, and that means bigger, more dangerous, destructive fires flaring up more quickly, more often.”
This summer, Victorian firefighters battled 200 fires in a single day, a volume of simultaneous demand that strains command structures, equipment and the endurance of personnel. The season ultimately resulted in the loss of 451 homes and more than 1,000 other buildings in Victoria alone.
In Tasmania, strong winds on 4 December fanned nearly 30 bushfires, destroying 19 homes on the east coast. Hobart recorded its windiest summer day at 98 kilometres per hour. Three weeks later, between 23 and 26 December, the state experienced daily snowfall. The range of extremes within a single month in a single state captures the disorienting character of modern Australian summers.
Mr Mullins noted that destructive fires are now occurring even on cooler days, driven by wind rather than heat alone. This expands the window of fire danger beyond the hottest days of summer, and confounds the traditional seasonal preparation models used by fire agencies and communities.
Mounting Costs, Stressed Budgets
The financial toll accumulates in ways that are visible in insurance premium notices, council balance sheets and government disaster recovery allocations.
Between 2019 and 2024, insurance companies paid out an average of $4.5 billion per year for extreme weather events. That figure is more than double the annual average across the prior 30 years.5 Those costs do not remain contained within the industry. They flow through to household premiums, through to properties that become uninsurable, and through to communities where rising premiums effectively price out lower-income residents.
At the local government level, the Mid Coast Council in New South Wales has applied for state and federal disaster recovery funding sixteen times since 2019. That frequency of application is not a sign of poor management. It is a measure of how regularly disasters now strike a single coastal council area and how thoroughly they exhaust local fiscal capacity.6
Summer extremes are also leaving lasting damage to ecosystems and agricultural land, with dead livestock, degraded pastures and compromised water catchments adding costs that do not always appear in insurance statistics but weigh heavily on regional economies.
What Comes Next
Dr Ashcroft noted that the Pacific Ocean typically resets between March and April, at which point climate scientists gain clearer sight of whether El Niño or La Niña conditions will dominate from May onwards. The prospect of an El Niño summer following the baseline already established by fossil fuel-driven warming is one that concerns scientists who observed what La Niña failed to prevent in 2025-26.
The Climate Council's report calls directly on governments to cease approving new coal and gas projects, and to accelerate the transition to clean energy. Mr Mullins framed the connection between energy policy and disaster cost as direct and immediate: “Disasters are costing Australians dearly.”
The report also identifies a specific mechanism by which continued fossil fuel investment worsens future fire risk. Every additional tonne of carbon dioxide released into the atmosphere raises the heat baseline. A higher baseline means more days above the thresholds that drive catastrophic fire conditions, more moisture cycling through the atmosphere to produce extreme rainfall events, and less recovery time between disasters.
A Nation at a Crossroads
Australia occupies a peculiar position in the global climate conversation. It is among the world's most exposed countries to climate impacts, and among the most significant exporters of the fossil fuels that drive those impacts. The summer of 2025-26 did not resolve that tension. It sharpened it.
Communities along the Great Ocean Road, in the outback of South Australia, in the freight corridors of the Nullarbor, and in the suburban fringes of Melbourne and Mildura are absorbing costs, physical and financial, that compound with each season. Their fire services, council budgets and household insurance policies carry a burden that is growing faster than the systems designed to absorb it.
The Climate Council's report lands at a moment when Australia faces a federal election and questions about the pace of its energy transition remain sharply contested. The summer's record heat, its fires and its floods do not determine how those political questions will be resolved. But they do define the conditions under which future Australians will ask the same questions, if the present trajectory continues.
Whether Australia's political settlement will keep pace with its physical reality is a question the 2025-26 summer raised with unmistakable urgency, and one that neither the heat nor the floodwaters have yet answered.
References
1. Climate Council: New report: Aussies flung from summer fires to floods in breakneck climate whiplash (2026)
2. Climate Council: Bronze Medal Nobody Wants: 2025 Earth's Third-Hottest Year (2026)
3. Climate Council: Breakneck Speed: Summer of Climate Whiplash – full report (March 2026)
4. Bureau of Meteorology: Melbourne climate data, December 2025
5. Insurance Council of Australia: Catastrophe statistics
6. Canberra CityNews: Summer climate ‘whiplash’ hitting harder and faster (March 2026)
7. Climate Council: Breakneck Speed – report landing page (2026)
8. IPCC Sixth Assessment Report: The Physical Science Basis (2021)