A big change in the weather will change summerlike conditions to winter across parts of the Northwest and Rockies.
Temperatures were well above normal in the Northwest most of the summer and that trend continued into early fall. October began with temperatures more typical of July or August in the northern Rockies. The high in Helena, Montana, soared to 84 degrees Tuesday, surpassing the daily record high of 81 degrees set in 1958. Helena’s average high for Oct. 5 is 64 degrees.
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https://www.freightwaves.com/news/1st-big-snowfall-of-season-possibly-coming-to-mountain-west