1926 - The temperature at Yellowstone Park dipped to nine degrees below zero. It was the coldest reading of record in the U.S. during September. Severe freezes were widespread over the northwestern U.S. causing great crop destruction. In Washington State, Spokane County experienced their earliest snow of record. Harney Branch Experiment Station in Oregon reported a temperature of 2 degrees above zero to establish a state record for the month of September.
More on this and other weather history
Day: Partly sunny. High near 70, with temperatures falling to around 68 in the afternoon. North northeast wind around 8 mph.
Night: Partly cloudy. Low around 47, with temperatures rising to around 50 overnight. North wind 2 to 6 mph.
Day: Mostly sunny. High near 74, with temperatures falling to around 72 in the afternoon. Northwest wind 2 to 9 mph.
Night: Mostly clear, with a low around 52. West wind 3 to 7 mph.
Day: Sunny, with a high near 76. West northwest wind around 6 mph.
Night: Mostly clear, with a low around 54.
Day: Sunny, with a high near 76.
Night: Mostly clear, with a low around 49.
Day: Sunny, with a high near 77.
Night: Mostly clear, with a low around 53.
Day: Mostly sunny, with a high near 80.
Night: Partly cloudy, with a low around 56.
Day: Mostly sunny, with a high near 78.
Night: Partly cloudy, with a low around 54.
Tue's High Temperature
108 at 16 Miles Southwest Of Tecopa, CA and Death Valley, CA
Wed's Low Temperature
19 at 14 Miles West-southwest Of Mackay, ID