Death Valley Earth at 134 °F (56.7 °C) on July 10, 1913, as well as the highest recorded natural ground surface temperature on Earth at 201 °F (93.9 °C) on July 15, 1972. Located near the border of California and Nevada, in the Great Basin, east of the Sierra Nevada mountains, Death Valley constitutes much of Death Valley National Park and is the principal feature of the Mojave and Colorado Deserts Biosphere Reserve. It is located mostly in Inyo County, California. It runs from north to south between the Amargosa Range on the east and the Panamint Range on the west; the
Death Valley October 1992. On average, 192 days per year in Death Valley have temperatures that reach 90 °F or more. Before being moved to Furnace Creek, the weather station at Greenland Ranch averaged 194.4 days annually where temperatures reached 90 °F or more. The lowest temperature recorded at Greenland Ranch was in January 1913. The period from July 17–19, 1959, was the longest string of consecutive days where nighttime low temperatures did not drop below . The highest overnight or low temperature recorded in Death Valley is , recorded on July 5, 1918, and the current world record for highest overnight