Winter came a little too soon for some Americans this week, as an early-season snow storm moved through parts of the western United States. And it’s more than just a dusting. The three day average shows several areas of South Dakota, Montana and Wyoming received more than seven inches of snow, according to the Weather Channel. Up to 18 inches was estimated to have fallen in the Bighorn Mountains in northern Wyoming. North Platte, Nebraska; Rapid City, South Dakota and Cody, Wyoming all reported the earliest snowfall on record this week. Boulder, Colorado also saw its first snow of the season, with less than an inch reported on Friday morning. More Photos on Huff Post.