The Death Valley expedition 1891, with Descriptions of New Species"". The Death Valley expedition The Death Valley expedition was an 1891 expedition to discover the geographic distributions of plants (phytogeography) and animals in California's Death Valley. It was the first of a series of expeditions funded by an 1890 act of the United States Congress. The expedition included biologists, naturalists, botanists, and zoologists. They produced valuable reports of historic significance in several fields, including ""Botany of the Death Valley Expedition"", "“The Death Valley Expedition: A Biological Survey of Parts of California, Nevada, Arizona, and Utah”", and ""Annotated List of the Reptiles and Batrachians Collected
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