Europe's Scorching Summer: Case Studies on the Economic Cost of Extreme Heat

A note before we start: several hyperlinks in this article reference foreign language sources. Longtime readers of this series know I strive to cite only high-quality research and authoritative government documents. Being an article focused on Europe, some government sources in the hyperlinks below require translation, which can be done through any number of online tools for those wishing to further deep dive European heat stress policy.

An Extreme European Summer

In 2021, a team of researchers from several European countries estimated the anticipated economic cost of severe European heatwaves. They predicted, by the 2060’s, increasingly extreme and frequent heat will result in Europe experiencing economic losses equal to over 1% of the continent’s total gross domestic product (GDP).[1] For the most exposed individual countries, economic losses could be closer to 3% of national GDP.

The summer of 2026 proved them right about the magnitude of anticipated economic loss, and dead wrong about their timeline.

Sweltering under record breaking heatwaves, Triodos Bank assessed that Europe this summer will experience economic losses around 1% of the continent’s total GDP attributable to extreme heat. That’s roughly the losses anticipated by the research team for 2060, more than three decades ahead of schedule.

Triodos’ estimate is towards the higher end of similar studies but hardly alone in finding extreme heat a significant factor in lost productivity. Allianz, a German financial service and insurance company, recently published that summer heatwaves cut about $128 billion, or half a percent of total GDP, across 30 European countries. And Swiss Re, a major global  reinsurer, recently noted Europe is the world’s fastest warming continent, with more heat driving an upward trend in insured losses due to “growing exposure” and “changing hazard patterns”, despite most heat-related business losses not covered by insurance.

In this article, we take a look at how the European economy handled a summer of extreme temperature. We’ll explore case studies on how heatwaves affected labor, labor laws, and reduced economic output and look at the science behind why Europe is experiencing such extreme summers. Those of us in the U.S. can learn a cautionary lesson from the European experience and begin adapting our own worksites and jobs to better prepare for summer heat.

Image from the European Center for Medium Range Weather Forecast, available here.

Quantifying Lost Worker Output 

Untangling the direct effect of heatwaves on GDP, and particularly labor-related productivity loss, isn’t easy. Many continent-wide economic estimates group labor loss in with heat-related but indirect impacts like droughts or wildfire. While droughts and wildfires are compounded by extreme heatwaves, economic losses associated with those events aren’t necessarily the direct result of extreme temperature.[2]

To isolate the effect of extreme heat on labor productivity losses, we can use more granular country and sector level reports. Perhaps the clearest signal is a British report considering just a single week of this June. Late June was particularly hot in England, bringing a heatwave and the hottest June temperatures ever recorded at 150 sites across Britain, many with records going back well over 100 years.

This British report, published by the London School of Economics, estimated economic losses exceeding about $1.5 billion dollars ( £1.15 billion), derived from an estimated 24 million hours of work lost due to the heatwave. Around 3.6% of the nearly 2,000 workers surveyed for the report said they didn’t work at all the week of 22 June 2026 because it was just too hot. This directly resulted in about 8 million lost labor hours.

Those that continued working reduced their hours by, on average, about a half hour per week due to the heat, adding 16 million additional lost labor hours. While a reduction in work hours was found across all sectors, including less physically demanding and indoor roles, workers in sectors more exposed to heat (e.g., outdoor workers) reduced their hours the most.

If you find it surprising that someone working indoors might cut work hours during a heatwave, consider this: even a clerk, banker, or barista working in an air-conditioned room might call out on a Friday if they’ve spent the week commuting in crowded, stiflingly hot public transportation. The London Tube (i.e., subway) regularly exceeds 90oF during heatwaves. This summer, some citizen reporters carried thermometers on their commute, posting conditions around 100oF.

Finally, the report notes economic figures only assessed work not performed and is therefore likely to be an underestimate. Actual economic losses are believed to be much higher, since work that does occur during heatwaves tends to be slower and less productive.

Government Intervention

Workers in Britain stopped working or reduced hours voluntarily during the June heatwave. In parts of Italy, local governments forced the decision, banning work completely, at least in some sectors, during periods when extreme temperatures created dangerously high heat stress. Beginning in late May, several Italian regions imposed 12:30-4:00pm work bans across sectors including construction, agriculture, and delivery, enforced on days when temperatures reached a high-risk threshold.

The ordinance from the Lombardy region is illustrative. Effective from June 10^th to nearly the end of September, it applied at worksites “despite the adoption of specific [heat stress] prevention measures” recommended last year by the Italian government. It didn’t matter what site-specific heat stress mitigation might already be in place; the Lombardy government enforced work bans regardless.

Of course, workers paid hourly took a financial hit from these bans. Italy’s national social security agency expanded its short-time wage fund so employers in construction and agricultural sectors could pay workers sent home because of the heat. The framing of these programs, with names like the “Wage Supplementation: Strengthened Protections for Extreme Heat”, left little doubt they were in response to unprecedented heatwaves. All told, Allianz estimated Italy lost nearly 28 billion Euros (about $32 billion) this summer due to extreme heat.

Tourism, one of Italy’s major economic drivers, wilted a bit as well. Italy’s tourism business association forecast that overnight stays would still grow slightly in August (official statistics have yet to be published). But tourism growth in famous renaissance cities like Rome, Venice, and Florence was essentially flat as extreme heat kept many visitors away. Cooler mountain destinations, meanwhile, saw demand rise nearly eight times faster than previous years.

Compounding Impacts

Some heat-related impacts across Europe were more obvious than others, even if they didn’t have a measurable or direct impact on overall productivity loss. This June, temperatures in France were the hottest experienced in well over 100 years. Top attractions in Paris, including both the Eiffel Tower and the Louvre, shut down early due to extreme heat.

Schools across Europe, not usually equipped with air conditioning, sent students home to wait out the heatwaves. During a late June heatwave more than 800 schools closed in France (nearly 2,000 more adjusted school hours), along with several hundred more in Britain. While many students undoubtably celebrated the unscheduled break, an educated workforce is a prerequisite to a modern economy.

Other impacts were more indirect. With air conditioning scarce, many French people headed to rivers and lakes to cool off. According to France’s national public health agency, this resulted in 274 deaths by drowning, 79% of which occurred during heatwave periods, which the government attributes to people seeking relief from the heat.

For a sense of just how hot it was in Europe this summer, consider 2003, a year when extreme heatwaves accounted for some 70,000 deaths across Europe. That deadly year, 11 days topped 86oF across at least 60% of western Europe. This year, western Europe experienced 17 days above that threshold, a nearly 55% increase.

Since 2003, two decades of heat-warning systems and public health planning have helped Europe adapt to hotter temperatures, but the toll is still severe. European health agencies are reporting preliminary heat deaths from this summer’s heatwaves in the thousands, currently led by Germany, where the national public health institute estimates about 16,000 heat-related fatalities. That is more than double its previous record.

Why Europe Got Burned

Europe is in an unfortunate position when it comes to rising temperatures. It is the world’s fastest warming continent, heating twice as fast as the global average. This summer was the hottest on record in western Europe, averaging 4.5oF above the 1991-2020 norm.

(Quick aside: scientists typically use a thirty-year period to define an “average” climate, a length of time less influenced by year-to-year variations and the multi-year global cycles impacting temperature, such as El Niño cycles or the Atlantic Multidecadal Oscillation. For our purposes, it’s sufficient to know 2026 really was much hotter than average across western Europe).

Why such a dramatic rise in heat stress across Europe? There is no single reason, but rather several factors combined.

First, Europe is further north than most Americans appreciate. Track a line of latitude around the globe and you’ll see Paris sits just south of the U.S. – Canada border. London actually sits well north of any major U.S. city except Anchorage, Alaska. Even warmer locations like Rome and Madrid sit roughly along the same line of latitude as New York City. Western Europe’s temperate climate is largely due to western winds off a relatively warm North Atlantic, keeping the western European continent more comfortable than similarly northern locations.

While you check a globe to confirm those latitude statements, also notice most of the world’s landmass lies above the tropics in the northern hemisphere. As the planet warms, more northern locations experience relatively faster warming than the tropics or southern hemisphere because land heats up faster than ocean. Ocean water stores enormous amounts of heat and mixes it into the cold depths, while land retains heat only in a thin surface layer.

An additional reason, Arctic amplification, also increases temperatures in two ways. First, as sea ice melts (it’s consistently covering less and less of the Arctic ocean), more solar radiation is absorbed by the ocean instead of reflecting off snow and ice. Secondly, open ocean (i.e., liquid water) cannot be colder than about 28oF (the freezing point of seawater in polar regions), so very cold air (<28oF) above the arctic circle actually draw heat from the (relatively) warmer exposed ocean.

But although geography explains much of Europe’s long-term warming, it doesn’t explain why western Europe’s summers have grown so extreme. That’s the next factor.

Historically, the jet stream across Europe has carried cooling storms from the North Atlantic. Increasingly, this jet stream is splitting, pushing those storms further north and leaving much of Europe to swelter under “heat domes”, or areas of high pressure where (cooling) storms don’t usually form. One recent study found such jet stream splitting might account for nearly all the accelerated heatwave trend in western Europe.

As the jet stream pushes storms north, warmer air increasingly flows in from the south. According to another study, western Europe in total experiences an additional 6oF to its hottest days for every 1.8oF of average global temperature increase. Approximately a quarter of this increase is due to hotter air flowing in from areas to the south, like North Africa.

Altogether, the combination of factors warming Europe (many of which researchers have, so far, underestimated based on recently observed trends) have led to maximum summer temperatures rising more than three times as fast as the global average temperature.

Lessons from Europe

Unfortunately, Europe as a whole isn’t yet equipped to fully deal with such increasingly intense heat. One Wall Street Journal headline this summer sums up the issue well: “Europe is Hot As Hell. Why Doesn’t It Want Air Conditioning?”. The article notes that in European homes accustomed to a cooler climate, air conditioning penetration is barely over 50% in Italy, 25% in France, and a minuscule 5% in Britain. In large part because of the scarcity of air conditioning, heatwaves affect Europe more than hotter U.S. cities like Phoenix, where air conditioning is found in nearly all homes.

However, not everyone can work in air-conditioned offices or factories. Some work simply needs to be done outside. Europe’s summer demonstrated two responses when cooling can’t reach the worker. In Britain, workers decided to quit on their own: millions of hours voluntarily unworked. In Italy, regional governments made the call for them, banning some work during the hottest hours of the day, trading lost output for heat illness prevention and leaving government funds to cover lost wages. Neither option keeps work moving.

However, there’s a third option: bring cooling to the worker. Germany offers a hint of how much that matters. In a survey of more than 4,000 German employees earlier this year, indoor workers with no cooling at all, whether shade, fans or air conditioning, were more than twice as likely to report heavy heat strain compared to those who had some cooling adaptation (50% vs. 20%). But shade, fans, and A/C isn’t available at all worksites.

Personal cooling is.

It’s the gap Qore Performance’s ICEAGE Ecosystem fills. The ICEPLATE® sits against the torso and draws heat directly out of the body through conduction. Paired with ICEVENTS® to keep air moving across the skin, it gives workers portable heat stress mitigation.

Personal cooling works alongside acclimatization, hydration, shade, and work/rest cycles for an extra boost to heat stress reduction. As Europe learned this summer, heat doesn’t wait for infrastructure to catch up, and extreme heat is arriving decades ahead of schedule. Worksites globally can learn a lesson from Europe’s scorching summer.