Winter in August? Montana, Wyoming Brace for Snow, Cold.

While much of the U.S. will swelter in heat and humidity this weekend, it will feel more like fall, or even winter, for much of Montana and Wyoming. An unseasonably cold low pressure system is expected to bring below-average temperatures to the northern Rockies through early next week. Temperatures will be up to 35 degrees below average in some locations this weekend. Glacier National Park may not even reach 50 degrees for a high on Saturday. In fact, low temperatures will drop below freezing in the higher elevations, leading to the chance for the first snow of the season to fall. In West Glacier, Montana, the average date for the first temperature below 32 degrees is Sept. 13, so the cold conditions are about three weeks ahead of schedule.

Article here