Death Valley to the Arctic: the hottest temperatures on record

A record high temperature is as much a paperwork question as a physics one. The World Meteorological Organization keeps the official archive of global weather and climate extremes. Its evaluation committee has spent more than a decade reopening old case files. Reviewers examine the thermometer, the shelter around it, the ground beneath and the observer's training. Readings that fail that audit lose their standing, no matter how long they sat unchallenged in reference books.

The hottest temperatures ever recorded on Earth come from a short list of places. Four regions supply most of them: the below-sea-level basins of California's desert, the Saharan fringe of North Africa, the inland Arabian Peninsula and the dry lowlands of Iran and Pakistan. What these sites share is sparse vegetation, cloudless skies, low elevation and terrain that traps heated air instead of letting it move on. Add a calibrated instrument and a trained observer, and a number enters the official record.

This list covers the figure that still stands as the global maximum and the Libyan reading thrown out in 2012 after forensic review. It takes in the certified continental records for Africa, Asia and Europe, the modern challengers from Death Valley, and a heat-and-humidity case from southwestern Iran. It also includes the Arctic Circle record verified in Siberia in 2020. It closes with Dallol, Ethiopia, which holds a different kind of record: the highest average annual temperature ever measured at an inhabited site.

Knowing where the bar actually sits makes every heat wave headline easier to read. A city at 45 degrees Celsius is in extreme territory but nowhere near a record. A verified reading above 54 degrees Celsius sits close to the ceiling of anything ever measured on Earth. The 10 entries that follow explain which numbers are official and which were discarded. They also show why Death Valley keeps returning to the top of the list more than a century after 1913.

Illustration: Quartz

The highest air temperature ever officially recorded on Earth is 134 degrees Fahrenheit, or 56.7 degrees Celsius, logged at Furnace Creek in California's Death Valley on July 10, 1913. The World Meteorological Organization still lists it as the global maximum more than a century later.

Geography explains much of the number. Furnace Creek sits roughly 190 feet below sea level in a narrow trough walled in by the Panamint Range to the west and the Amargosa Range to the east. Air warmed at the valley floor rises, drifts up the slopes, then sinks back down and compresses as it descends, gaining heat again on the way. Add bare rock and salt pan holding almost no moisture available to evaporate, and the basin behaves like a sealed chamber through July and August.

The reading has been contested. Weather historian William Reid published an analysis arguing that the July 1913 figures were out of line with observations from surrounding stations and were most likely the product of observer error. That argument has circulated in meteorological circles ever since without a resolution. The WMO's evaluation committee has examined the case and left the record standing, so 1913 remains the benchmark every later claim is measured against.

Furnace Creek has not stopped producing extremes. The station clears 120 degrees Fahrenheit on a routine basis in midsummer, which keeps the valley in heat coverage year after year. Instruments at the site are now automated and calibrated to modern standards, so a future reading there would carry far less of the uncertainty that hangs over a handwritten 1913 logbook.

Whether or not the 1913 figure survives later scrutiny, the same combination of depth, enclosure and dry ground that produced it makes the basin the likeliest place on the planet to generate the next verified world record.

Illustration: Quartz

A reading of 58.0 degrees Celsius, or 136.4 degrees Fahrenheit, logged at El Azizia, Libya, on September 13, 1922, stood as the world's hottest temperature for 90 years. The World Meteorological Organization invalidated it in September 2012 after a forensic review of the original measurement.

The international panel assembled by the WMO worked through the station's handwritten logs and found a cluster of problems. The observer on duty was new to the post and almost certainly untrained. That observer also appears to have misread the instrument. The thermometer in use was a replacement of an unfamiliar type, not the model the station had relied on previously. The panel further concluded that the site itself was poorly suited to the task, with a dark surface of sand and gravel beside the shelter that would have radiated extra heat toward it.

Comparison with surrounding stations sealed the decision. No other location in the region reported anything near 58 degrees Celsius that day, and El Azizia's own records before and after 1922 showed nothing in that range. An outlier that extreme, unsupported by neighboring data, does not survive modern verification standards.

The investigation grew out of a wider WMO effort, begun in 2007, to build and audit a formal archive of weather and climate extremes using archival research and instrument analysis. That archive now catalogs verified records across categories including temperature, rainfall, hail size, wind speed and lightning. The Libyan case became its most consequential reversal.

The decision reset the ground rules for how the global archive treats century-old numbers. Instrument type, station exposure, observer training and agreement with nearby stations are all weighed before a reading is entered or allowed to stand. Invalidating the Libyan figure returned the world record to Furnace Creek, California, where it has stayed since. The case is also why meteorologists approach pre-1940s extremes with caution unless supporting station logs and equipment documentation survive alongside the number itself.

Illustration: Quartz

Kebili, an oasis town in southern Tunisia, reached 55.0 degrees Celsius — 131 degrees Fahrenheit — on July 7, 1931. The World Meteorological Organization lists it as Africa's highest verified air temperature, a title the town inherited after the Libyan claim from 1922 was struck from the archive in 2012.

Geography explains much of the number. Kebili sits in the Nefzaoua region, near the southern edge of the Chott el Djerid salt flat, where Tunisia's interior steppe gives way to open Sahara. Elevation is low, July cloud cover is close to nonexistent, and the pale salt pan and bare desert floor heat quickly under near-vertical midday sun. Humidity stays low, so almost all incoming solar energy warms the air instead of evaporating moisture.

The town's date palm groves, fed by artesian water, cover a small footprint against that landscape, and they do little to cool the broader air mass moving over the station. Summer highs across the Nefzaoua regularly top 40 degrees Celsius, which places the 1931 figure well above an ordinary July afternoon without putting it in an entirely separate category.

The reading predates automated instrumentation by decades, which places it in the same category of early 20th century measurements the WMO began auditing in 2007. Kebili's figure remains in the archive; El Azizia's does not. The Libyan claim was removed after investigators identified problems with the observer, the thermometer and the surface beneath the instrument shelter, and no equivalent finding has been published against the Tunisian record.

Nearly a century on, the mark still stands. Algeria, Morocco and Tunisia log summer maxima approaching 50 degrees Celsius most years, and Saharan heat waves periodically push into the low 50s. None has produced a verified figure above Kebili's. That makes the 1931 reading one of the longest-surviving continental extremes anywhere in the WMO archive, and the benchmark every new North African heat wave is measured against.

Illustration: Quartz

Mitribah, a weather station in northern Kuwait close to the Iraqi border, recorded 54.0 degrees Celsius — 129.2 degrees Fahrenheit — on July 21, 2016. The World Meteorological Organization certified it as the official air temperature record for the Asian continent, and it has not been beaten since.

Kuwait's interior offers almost nothing that would slow the heating of the air. The subtropical high-pressure belt that parks over the Arabian Peninsula through the summer keeps skies clear for weeks at a stretch, so solar radiation reaches the surface at close to full strength day after day. There is minimal vegetation to release moisture and no appreciable cooling from evapotranspiration. Stations set well inland, Mitribah among them, also escape the moderating effect of the Persian Gulf, which holds coastal readings a few degrees lower while pushing humidity higher along the shoreline.

Verification was comparatively simple in this case. The reading came from an automated station with modern, calibrated sensors and a documented maintenance history, which spared the evaluation committee the detective work required for extremes logged by hand a century ago. The WMO announced its confirmation in 2017, about a year after the reading was taken. In the same review, the committee also validated a 53.9 degree Celsius reading from Basra, Iraq, logged the following day as the same air mass pushed north.

Readings above 53 degrees Celsius have recurred across Kuwait and southern Iraq during peak July and August heat in the years since, placing this corner of the Arabian interior among the most consistent producers of extreme air temperatures anywhere on the planet. The Mitribah site sits in open desert rather than inside a built-up area, which matters for how the number is read: it reflects desert air under full sun, not a figure lifted by pavement, buildings and the other surfaces that make cities measurably hotter than the land around them.

Illustration: Quartz

Turbat, a city in Pakistan's Balochistan province, reached 53.7 degrees Celsius, or 128.7 degrees Fahrenheit, on May 28, 2017. The figure sits among the highest air temperatures ever measured in Asia, just below Kuwait's certified continental record.

Balochistan's southwestern lowlands heat up quickly in the weeks before the monsoon. Turbat lies in the Kech Valley, roughly 100 kilometers inland from the Arabian Sea, at an elevation low enough that altitude offers no relief from the afternoon sun. The surrounding terrain is rock and bare soil with almost no vegetation to cool the air through transpiration, and clear skies through April and May allow solar heating to build day after day. By late May the valley routinely sits in the high 40s Celsius before seasonal rain breaks the pattern.

The World Meteorological Organization has not certified the reading as an Asian continental record, and it has not been through the agency's formal evaluation process. Kuwait's 2016 Mitribah measurement of 54.0 degrees Celsius remains the only figure the WMO recognizes for the continent. Pakistan's meteorological department logged and reported the Turbat number, and forecasters tracking South Asian heat have treated it as plausible, given the station's instruments and its history of consistent reporting. Its standing is credible but informal — accepted in practice, unverified on paper.

The timing of the May 2017 event drew as much attention as the number itself. Severe heat reached southern Pakistan weeks ahead of the monsoon, straining an electricity grid already prone to load shedding at peak demand. Comparable pre-monsoon extremes have recurred across Pakistan and northern India in the years since, and Turbat's number is the comparison point regional forecasters reach for when spring temperatures climb toward the low 50s Celsius. Jacobabad, farther northeast in Sindh province, draws similar scrutiny for the mix of heat and humidity it records during the same season.

Illustration: Quartz

Furnace Creek recorded 130 degrees Fahrenheit, or 54.4 degrees Celsius, on August 16, 2020, then matched that figure on July 9, 2021. The two readings tie for the third-hottest air temperature reliably measured anywhere on Earth, behind the 1913 Death Valley mark and Tunisia's 1931 reading.

Both came from the automated station at Furnace Creek, whose observations the National Weather Service relays and submits for formal evaluation. Any figure that lands within a few degrees of a historic extreme triggers additional checks on sensor calibration, maintenance logs and station siting before it can enter the global archive. The evaluation runs slowly by design, and a number can circulate in news coverage for months or years before its status is settled.

The equipment separates these two figures from the older entries on this list. The 1913 and 1931 measurements came from manual instruments in an era of uneven observing standards. The 2020 and 2021 numbers came from calibrated electronic sensors with continuous digital records, which makes them the highest temperatures captured by modern automated instrumentation, whatever ranking they finally receive. That documentation trail is why meteorologists treat the recent pair as better evidenced than the century-old figures ranked above them.

Each reading arrived inside a wider Western heat wave. The August 2020 event pushed California's grid operator to order rotating power outages. The July 2021 episode baked the interior West during a season of severe drought and heavy wildfire activity across California, Nevada and Arizona.

Repeat readings at the 130-degree threshold have revived a question climatologists return to each summer: whether Death Valley can threaten its own 1913 figure of 134 degrees Fahrenheit. Nothing measured since has closed that four-degree gap. The basin still delivers multiple days above 125 degrees Fahrenheit in a typical July, which keeps Furnace Creek the most reliable place on the planet to look for a new maximum, and explains why one California valley appears twice on any serious list of verified heat extremes.

Illustration: Quartz

Ahvaz, an industrial city in southwestern Iran, recorded 53.7 degrees Celsius — 128.7 degrees Fahrenheit — on June 29, 2017. The figure ranks among the highest air temperatures ever measured in the Middle East outside the Arabian Peninsula.

The city sits in Khuzestan province, a flat, low-lying stretch of land near the Iraqi border and a short distance inland from the head of the Persian Gulf. Summer there pairs relentless sun with moisture drifting in off the water, a mix that makes conditions harder on the body than the thermometer alone suggests. Sweat evaporates poorly in humid air, which strips away the main mechanism humans rely on to shed heat. A dry 53 degrees Celsius in a desert interior and a humid 50 degrees Celsius in Khuzestan are not equivalent exposures.

The reading came from an official station operated under Iran's national meteorological service. It has not been certified by the World Meteorological Organization, which examines instrument calibration, site exposure and observer records before awarding a continental or national extreme. That leaves the Ahvaz figure in a different category than the verified marks at Mitribah, Kuwait and Kebili, Tunisia, even though the station used modern equipment and the province produces comparable late-June heat most years.

Khuzestan and the adjacent lowlands of southern Iraq generate some of the world's highest heat index values year after year, even in summers when the air temperature stops short of the records set further south. The physiological ceiling is measured in wet-bulb terms: once the wet-bulb temperature reaches about 35 degrees Celsius, sweat can no longer evaporate fast enough to keep the body's core temperature stable, and healthy adults cannot survive prolonged exposure outdoors. The northern Gulf is one of the few places on Earth to have come near that threshold.

Ahvaz carries weight in these discussions because it is a city of more than a million people, not an isolated desert outpost with a weather station and no residents. Power demand spikes, outdoor labor and uneven access to cooling turn a record reading into a public health event.

Illustration: Quartz

Europe's official temperature record is 48.0 degrees Celsius, or 118.4 degrees Fahrenheit, measured in the Athens area on July 10, 1977. The World Meteorological Organization still lists that reading as the continental maximum, nearly half a century on.

The heat arrived during a sustained Mediterranean episode, with high pressure parked over the region and hot air pushing north from Africa. Greece has the geography to amplify that setup: low coastal plains, dry summer soils holding almost no moisture to evaporate, and a capital ringed by mountains that limits ventilation. Athens was also far less equipped for heat in 1977 than it is today, with limited air conditioning and no coordinated emergency plan. Hundreds of heat-related deaths in Greece were linked to the event.

Later European heat waves have been deadlier without producing a higher certified number. The August 2003 episode across France and Western Europe killed tens of thousands of people continent-wide, but the temperatures driving it sat mostly in the low 40s Celsius, short of the Athens figure. A station at Floridia in Sicily logged 48.8 degrees Celsius in August 2021, a reading that would top the Greek mark if confirmed, though the WMO has not certified it as a new European record.

Verification of a near-record number is slow by design. Investigators check the sensor's calibration, the screen housing it, the surface beneath the site and the surrounding exposure, and that review can stretch across years. A reading only enters the archive once every one of those elements holds up.

Europe's ceiling sits lower than the extremes measured in California, Tunisia and Kuwait. The continent has more maritime influence and far less of the deep, uninterrupted desert interior that pushes readings into the mid-50s Celsius. Whether the 1977 number survives depends less on how hot Southern Europe gets than on whether a qualifying station happens to be standing in the right place when it does.

Illustration: Quartz

The highest temperature ever verified north of the Arctic Circle is 38 degrees Celsius, or 100.4 degrees Fahrenheit, logged at Verkhoyansk in Russia's Sakha Republic on June 20, 2020. The World Meteorological Organization confirmed it and opened a new Arctic category in its extremes archive.

Verkhoyansk built its reputation at the opposite end of the scale. The town holds roughly 1,000 residents on the banks of the Yana River. Winter lows there fall past minus 60 degrees Celsius, and the settlement is routinely counted among the coldest permanently inhabited places on the planet. A single station swinging from those depths to triple digits Fahrenheit gives Verkhoyansk one of the widest annual temperature ranges on Earth.

The June 2020 figure did not arrive in isolation. Siberia ran far above its seasonal average through the first half of that year. A stalled high-pressure system held clear skies and sinking air over the region for weeks. Daylight compounds the effect this far north in late June, when the sun barely sets and the ground gets almost no overnight window to shed heat.

The consequences extended past the thermometer. That summer brought severe wildfire activity across Siberian forest and tundra, including fires burning into peat and permafrost soils that hold large volumes of carbon. Thawing permafrost also destabilizes the ground under roads, pipelines and buildings throughout the Russian north.

Verification followed the same route as any candidate extreme, with the WMO checking the station's instruments, its calibration history and the exposure of the site. Creating a separate Arctic category answered a practical problem. The region is warming faster than the global average, and an archive that had catalogued the far north mainly for cold needed somewhere to file its heat. The Verkhoyansk reading gave that trend a specific, certified number rather than a general description. Whether the mark survives the next Siberian heat wave is a question of ongoing monitoring rather than settled record-keeping.