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The City of Great Falls is located along the main stem of the Missouri River at its confluence with the Sun River at an elevation of 3,674 feet above sea level. The airport is approximately two miles southwest of the Sun and Missouri River Junction. Except to the north and northeast, the valley is encircled by mountain ranges, which lie about 30 miles away from east to south, 40 miles to the southwest, and 60 to 100 miles distance from west to northwest. Topography plays an important part in the climate of Great Falls . The Continental Divide to the west, and Big and Little Belt Ranges to the south are primary factors in producing the frequent wintertime "chinook" winds observed in this part of Montana . The combination of valley and plateaus in the immediate area contributes to marked temperature differences between the airport and the city proper, either on calm, clear mornings, or when Chinook winds reach the airport before they are felt at the lower elevations in town.
| Seasonal Average |
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| Comfort Index |
65.8 |
| Inches of rain |
15 inches |
| Inches of snowfall |
63 inches |
| Number of days with some precipitation |
103 days |
| Number of sunny days each year |
187 days |
| Average temperature in January |
11 ° F |
| Average temperature in July |
83 ° F |
| Elevation |
3,674 |
| Number of days less than 32 ° F |
155 days |
| Number of days greater than 90 ° F |
18 days |
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