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
Night: Patchy fog after 2am. Partly cloudy, with a low around 46. North wind 0 to 5 mph.
Day: Mostly sunny, with a high near 73. West wind 0 to 5 mph.
Night: Partly cloudy, with a low around 52. Northwest wind 0 to 5 mph.
Day: Mostly sunny. High near 66, with temperatures falling to around 61 in the afternoon. Northeast wind around 5 mph.
Night: Mostly clear, with a low around 46. Southeast wind 0 to 5 mph.
Day: Sunny, with a high near 76.
Night: Mostly clear, with a low around 51.
Day: Sunny, with a high near 77.
Night: Mostly clear, with a low around 50.
Day: Mostly sunny, with a high near 74.
Night: Partly cloudy, with a low around 51.
Day: Mostly sunny, with a high near 71.
Night: Mostly cloudy, with a low around 50.
Day: Partly sunny, with a high near 68.
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