What are some ways that we know it is winter? Why is winter important to living things in Glacier National Park? Objective Students will be able to: list Montana’s four seasons-spring, summer, fall, winter and use visual/picture cues to identify seasons. Background Every season in Montana holds surprises. Rainfall is generally light, with most falling in spring between May and July. Average rainfall for Western Montana is 18 inches a year; 13 inches for the eastern side of the state. During summer, brief mid-day thunderstorms are common, and heavy rains provide cool afternoon temperatures. By Duration: 60 Minutes Additional Standards: NGSS 1-LS1-1 Use materials to design a solution to a human problem by mimicking how plants or animals use their external parts to meet their needs 1-ESS1-2. Make observations at different times of year to relate the amount of daylight to the time of year. Essential Q.