Death Valley Illusion: Evidence Against the 134 °F World Record

Abstract The world record hottest near-surface air temperature of 134 °F recorded at Greenland Ranch, Death Valley, California on 10 July 1913 is demonstrated to be approximately 14 °F hotter than what likely occurred on that date. Using July data from non-Death Valley stations during 1923 to 2024 we compute a range of temperature lapse rates diagnosed from the differences between Greenland Ranch station and the average of higher-elevation stations’ maximum temperatures ( T MAX ) and elevation. The range of lapse rates from those 102 years of July data are then used to estimate Greenland Ranch temperatures during the early years (1911-1922). The first two weeks of July 1913 are shown to be spuriously hot, and other years at Greenland Ranch exhibit anomalous July temperature behavior as well. Despite the establishment of a U.S. Weather Bureau instrumented shelter at Greenland Ranch in 1911, based upon historical accounts we believe some of the shelter readings in the early years were replaced with hotter values, possibly taken from the veranda of the ranch house using a thermometer of unknown provenance. As a result of these findings, we recommend that the 134 °F world record status be rescinded, and that many of the Greenland Ranch temperature reports during the early years be more closely evaluated for data quality.