Montana Weather

Montana climate

Montana's climate is defined by its position as a gateway between the Pacific maritime influences from the west and the harsh continental climate of the northern Great Plains. The state holds the record for the largest 24-hour temperature change in U.S. history, when Loma experienced a 103-degree rise from minus 54 to 49 degrees Fahrenheit in January 1972. The Continental Divide runs through the western mountains, creating dramatically different weather on either side.

Western Montana benefits from Pacific moisture that brings relatively mild winters with heavy mountain snowfall, while eastern Montana is exposed to bitter Arctic air masses with much less precipitation. Glacier National Park and the surrounding mountains receive over 100 inches of snow annually, supporting glaciers that have been retreating due to warming temperatures. Chinook winds along the Front Range can raise temperatures 40 to 50 degrees in just a few hours.

Summer weather in Montana is generally pleasant, with warm days and cool nights across most of the state. Thunderstorms and dry lightning are common in summer, frequently sparking wildfires in the vast forested regions. The eastern plains can experience severe thunderstorms with large hail and tornadoes. Montana's winters are among the coldest in the lower 48 states, with temperatures regularly dropping below minus 20 degrees Fahrenheit in the interior valleys.