montanas geography has a big effect on the climate.the wide plain allows super cooled arctic air from the north to meet warmer air from the south creating favorable.conditions for snow. also, the high mountains block and trap cold dry air, keeping it from the lower altitudes in the inter mountain valleys.the snow that accumulates in the high mountains allow for fertile, well watered lands up and.down the state. so like anyplace, geography plays a big role in the climaye.
The Rocky Mountains in Montana help in the regulation of the climate as they help to regulate the amount of temperature. The wide river valleys also help maintain a cool breeze during the day and warm during the cold nights. You can view the geography of Montana at http://www.netstate.com/states/geography/mt_geography.htm.