the fp is weather-climate-geography
Montana Weather, climate and geography
Weather and climate
Best time to visit
Summer temperatures average from 14.4°C to 30°C (58°F to 86°F). Seasonal extremes are greater to the east of the Continental Divide. The Great Plains are subject to waves of frigid arctic air six to 12 times each winter. Winter temperatures average -10.6°C to -0.6°C (13°F to 31°F).
Lightweights for the summer and heavyweights with extra bundling for the winter.