Topographic relief is significant as the summit rises 3,950 feet (1,204 meters) above the Suiattle River in three miles (4.8 km).

[6] As a result, valleys in the area are deep and U-shaped, and mountains tend to be rocky, with steep slopes and narrow summits.

Gamma Peak is located in the marine west coast climate zone of western North America.

As a result, the west side of the North Cascades experiences high precipitation, especially during the winter months in the form of snowfall.

[6] Due to its temperate climate and proximity to the Pacific Ocean, areas west of the Cascade Crest very rarely experience temperatures below 0 °F (−18 °C) or above 80 °F (27 °C).