The climate in Montana is Pacific coastal. The western region of Montana has mild winters and cool summers. Since Montana is a relatively larger state, its climate is quite diverse and temperatures vary in different regions of the state. In the eastern region, the climate is semi-arid to continental climate. It has cold winters and warm summers. January is the coldest month of the year. Maximum snow is received in this month. The temperature in January can drop down to 0°F. July is the hottest month of the year here. The temperature varies from 75°F to 88°F.