Kalispell Miles City Missoula West Glacier West Yellowstone Whitefish Other Communities Montana weather can vary greatly from one day to the next. F. Most days are sunny, although afternoon showers are common in the mountains.
Autumn is a season of transistion as the warm summer days fade giving way to cooler weather.
The mountains often receive their first snowfall in September while the valley areas usually see snow by Halloween. During this time of the year, Aspens and other deciduous trees provide a beautiful sight as their leaves turn colors. By November, the weather usually turns colder and precipitation is more often in the form of snow. December marks the beginning of winter, which is a favorite season for many Montanans. As the snow accumulates, ski resorts open for much fun and excitement.