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Last Month Was Idaho's Coldest October On Record

National Centers for Environmental Information
Idaho experienced the coldest average temperatures on record in October of 2019.

Last month was the coldest October on record in Idaho, according to NOAA's National Centers for Environmental Information. Records for statewide average temperatures date back to 1895.


The average temperature in Idaho for October 2019 was 36.7 degrees Fahrenheit. The mean October temperature between 1901 and 2019 in the state was 44.1 degrees Fahrenheit.

The National Weather Service offices in Pocatello and in Boise both shared lists of Idaho cities that broke their own records for coldest October temperatures. They include Jerome, Pocatello, Burley, Stanley, Blackfoot and Ketchum.

Other places in the Mountain West and Pacific Northwest saw record low temperatures, too.


Steve Parker with the National Weather Service in Boise said a jet stream in Alaska moving south caused the cold temperatures. 


“It came back down over the Pacfic Northwest. And as it did that it was able to bring a lot of that cold air from Western Canada down over us," Parker said.

Parker said this weather pattern is typical, and is often responsible for cool swells felt in the region, but that this one was unexpectedly early in the season.

He said the October cold doesn't reveal much about the winter ahead, but he said it is surprising to see temperatures flip to above average so far this November. 

Find reporter Rachel Cohen on Twitter @racheld_cohen

Copyright 2019 Boise State Public Radio


As the south-central Idaho reporter, I cover the Magic and Wood River valleys. I also enjoy writing about issues related to health and the environment.