The Hottest Day on Earth Was Recorded 113 Years Ago Today. It Probably Wasn't That Hot. — Woody Magazine, Jul. 10, 2026
The Hottest Day on Earth Was Recorded 113 Years Ago Today. It Probably Wasn't That Hot.
In the gift shop at Furnace Creek, deep inside Death Valley National Park in California, there is a T-shirt that reads simply: 134. The Las Vegas Review-Journal once called it the shop's signature item. No further caption is needed. In this valley, everyone knows what the number means. It is Fahrenheit—56.7 degrees Celsius—the temperature recorded on this very spot on July 10, 1913, exactly 113 years ago today. For more than a century it has stood as the highest air temperature ever measured on the surface of the Earth, certified by the World Meteorological Organization.
These days, though, you would be hard-pressed to find a meteorologist who takes the number at face value. Last fall, a paper in the Bulletin of the American Meteorological Society arrived with a title that wasted no words: "Death Valley Illusion." Its conclusion wasted even fewer. Death Valley was not that hot on July 10, 1913, the authors argue, and the world record ought to be rescinded. The number the gift shop sells on a T-shirt is a number the field is trying to erase.
The site of the record was less a weather station than a working ranch. Greenland Ranch sat in a basin 178 feet below sea level. The U.S. Weather Bureau installed a standard instrument shelter there in 1911, but the job of reading the thermometer and writing the figure into a logbook fell to the ranch foreman, a man named Oscar Denton. The first observer of the world's hottest temperature, in other words, was not a meteorologist. He was someone minding a ranch in the middle of the desert.
In July 1913 his logbook produced a run of scarcely believable figures: 134°F on the 10th, 130°F on the 12th, 131°F on the 13th. The trouble was that no one could check them. In that era there were only a handful of weather stations within 155 miles of Death Valley, and every one of them sat at a much higher elevation. There was no neighbor to say the reading on the valley floor looked wrong. That silence would go on protecting the number for the next 113 years.
Doubt set in early. As soon as 1915, someone noted that no exceptional heat wave had swept the region on that date. In 1949 the meteorologist Arnold Court offered a different angle: a sandstorm, he suggested, might have blown superheated surface material into the shelter and driven the thermometer up. In 2016, the weather-records historian Christopher Burt and William Reid—who had studied Death Valley's climate for three decades—published a joint investigation concluding the figure was, on meteorological grounds, essentially impossible. But doubt was still only doubt. To know the real temperature that day, someone had to build the control group that 1913 never had.
Last fall, Reid did exactly that, in the BAMS paper written with Roy Spencer and John Christy of the University of Alabama in Huntsville. The method is simple and relentless. Using 102 years of July data, from 1923 to 2024, they calculated the lapse rate—how quickly temperature falls as elevation rises. Think of it as a conversion table for the way the air cools as you climb a mountain. Feed the July 10, 1913 readings from the surrounding highland stations into that table, and it tells you what Greenland Ranch, on the valley floor, should have been that day. The neighbor that didn't exist in 1913 was reconstructed, a century late, out of a hundred years of data.
The answer came back near 120°F, or 48.9°C—roughly 14 degrees Fahrenheit below the official record. Still murderous heat. Nowhere near a world record. So why did Denton's logbook climb to 134? The study reconstructs a plausible story. For years, going back to the 1890s, the ranch had traded rumors of 135°F readings taken from a thermometer hung on the veranda, and its reputation as the hottest place on Earth was an asset worth defending. The authors suspect Denton may have copied a figure from that unregulated veranda thermometer into the official log, in place of the reading from the regulation shelter. The shelter's own placement is suspect, too. It was first set on the edge of an irrigated field—a cooler spot, if anything—but later photographs suggest Denton moved it to a hotter site above bare ground, without approval or any record of the change. The move alone does not explain 134°F, but it fits a pattern of straying from proper observing protocol.
The clinching evidence is the silence that followed. In the 113 years since, Death Valley has never come close again. It did not so much as touch 130°F a second time until 2020. If the hottest place on the planet cannot break its own record for a century, the sensible move is to doubt the record. That single week of July 1913 stands alone, a spike no other year in the history of the thermometer has matched.
If that answers the question of how hot the day actually was, one more remains: could the man who wrote the number down be trusted? Denton's logbook carries other fingerprints. The study notes that in July 1918, 22 of the month's 31 daily highs were written down as multiples of five—105, 110, 115—against a 102-year average of just 6.7 such days a month. It reads less like a thermometer being read than a number being rounded off by eye. The same hand that logged the world record was, a few years later, spinning the dial to the nearest five. Two separate doubts—about the reading and about the reader—now converge on a single number.
Here a fair objection arises. It is a WMO-certified record—can a few researchers really wave it away? A fair question. And the answer to it is where the real machinery of this story sits. World temperature records have an official keeper: the WMO's Archive of Weather and Climate Extremes. A record leaves that archive by exactly two routes. Either a higher number passes review and displaces it, or the existing number fails review and is struck. Either way, the deciding act is not the measurement. It is the review.
There is precedent for the second route. The world record did not always belong to Death Valley. For ninety years the throne was held by a reading of 58.0°C taken at El Azizia, in Libya, on September 13, 1922. When Burt raised objections, the WMO assembled an international panel; its work was interrupted by the Libyan civil war, and in 2012—ninety years to the year after the reading—the record was decertified. The stated grounds: an inexperienced observer had likely misread an unfamiliar instrument, compounded by problems of siting and procedure. The moment that throne fell vacant, the number sitting in second place—Death Valley, 1913—rose to take it. Not because it had passed a fresh review. Simply because it was next in line.
The Libyan record collapsed once comparison data and context surfaced. The Death Valley record only reached the dock at all after 102 years of surrounding data had accumulated. What separated their fates was not the quality of the thermometer, but whether there was a witness standing nearby. And the pattern holds well beyond temperature. A number from an age with no way to verify it; a record left standing alone; a legend with nothing to measure it against. Long survival is not evidence that a claim is correct. It may only mean the tool to refute it arrived late.
None of which means the Death Valley record is about to vanish. The WMO has not moved. In 2023, Randall Cerveny, its rapporteur on weather and climate extremes, said that both the U.S. National Climate Extremes Committee and the WMO archive accept the 1913 observation, while adding that the archive is willing to investigate if credible new evidence is presented. Decertification would run through the U.S. committee's review before a final WMO ruling—a process that takes years. Whether last fall's paper counts as that "new evidence" is the question now sitting in front of the record.
If 134 falls, who inherits the throne? Here the accounting splits. The next line in the WMO's certified list is 55.0°C, set at Kebili, Tunisia, in 1931—but that figure comes from the same era and the same kind of observation, and draws the same suspicion. Burt notes that once a proper station was built at Kebili after the Second World War, it never again topped 118°F, at least through 2012. The top of the old ledger, in other words, is mostly the blurry work of that early era.
Narrow the question to the hottest temperature reliably measured with modern instruments, and the answer circles back to Death Valley. On August 16, 2020, and again on July 9, 2021, Furnace Creek hit 54.4°C (130°F)—the internal temperature of a medium-rare steak. The WMO placed both readings under review, the kind that involves shipping the sensor to an independent calibration lab, and no certified verdict has yet been issued. An organization that spent years dismantling a ninety-year-old record keeps an equally narrow door for admitting a new one.
So Burt's summary is probably the truest one. Whether the old record survives or is struck, the title of hottest place on Earth ends up with Death Valley either way. The only real casualty is a gift shop with a stack of "134" T-shirts. And yet this summer, as the heat news dutifully counts its "all-time" highs, the number at the very top of the scale is quietly wobbling—still, for now, a figure that may have been written down on a ranch veranda in the middle of the desert, 113 years ago today.
The world's hottest reading survived 113 years not because it was precise, but because no neighboring station existed to prove it wrong.
- Spencer, Christy & Reid, "Death Valley Illusion: Evidence against the 134°F World Record," Bulletin of the American Meteorological Society 107(1), 2026
- American Meteorological Society Headlines, "Global Record in Question" (Nov. 2025)
- World Meteorological Organization, "WMO is monitoring potential new temperature records" (Jul. 2023)
- Live Science, "Death Valley's 'world's hottest temperature' record may be due to a human error"
- Yale Climate Connections, "Death Valley breaks the all-time world heat record for the second year in a row" (Jul. 2021)
- Burt & Reid, "An Investigation of Death Valley's 134°F World Temperature Record," Weather Underground (2016)
- Las Vegas Review-Journal, "Death Valley's heat record, set in 1913 at 134 degrees, comes under fire"
- El Fadli & Cerveny et al., WMO assessment of the El Azizia record, BAMS 94(2), 2013 (link unverified)
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