A Breakdown Of Typical First Snows! (credit: NWS Glasgow, Montana)

DISCUSSION: Here is a neat graphic (courtesy of the National Weather Service office in Glasgow, Montana) which encompasses a wide array of recognized reporting stations across the Western United States and their corresponding typical dates by which the first snowfall typically occurs!  Note how in the more mountainous terrain, there tends to be an earliest first snowfall which makes sense since those locations are at a higher altitude which makes them more more vulnerable to colder temperatures earlier in the Fall-time months and prone to earliest snowfall events.  

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©2017 Meteorologist Jordan Rabinowitz