Europe experienced unprecedented heat in June, with temperatures soaring to levels previously unseen across much of the continent. A new analysis from World Weather Attribution, a research collaboration focused on extreme weather, states that such a heatwave would have been nearly impossible half a century ago, when global temperatures were significantly cooler.
The study ties the extraordinary heat to long-term climate change, driven by increased emissions of carbon dioxide and other greenhouse gases since industrialization. It highlights that temperatures in Western Europe during this June’s heatwave were far above normal, with about a 99% chance such an event would not occur without global warming.
Researchers compared current conditions to past decades, noting that similar heatwaves were less likely—though still rare—in the early 2000s, when the planet was cooler by roughly 0.6°C. Going back 50 years, the probability of such an extreme event was virtually zero, with temperatures about 3.5°C colder in the spring–summer months. The study also points to environmental changes such as shrinking Arctic sea ice, diminished winter snow cover, and cleaner air allowing more sunlight to heat the surface as contributing factors that intensified the heatwave’s severity.
The health impact has been severe. The World Health Organization reported more than 1,300 excess deaths across Europe by late June, with France alone accounting for around 1,000 fatalities attributed to the extreme heat. This highlights the vulnerability of many regions, especially those in Northern Europe where infrastructure and public health systems are less prepared for sustained high temperatures.
The lead scientist involved, affiliated with Imperial College London, stressed that such an event would not have occurred in June without human-induced climate change. The study also underlines that future heatwave frequency and intensity depend heavily on the effectiveness of global emission reduction efforts.