Over the years, with ballistic missiles, more sophisticated bombers, aerial refueling, and satellites, Thule's defense mission has changed somewhat. Even so, it is still an amazing accomplishment. Large summer ice floes may also drift down from Smith Sound and icebergs from Baffin Bay. At times sea navigation can be difficult. The ice-free land is generally rolling hills and valleys with streams running from the ice cap or glaciers.
Most cliffs are adjacent to fjords, bays, or glaciers and have extensive talus slopes below.
The highest elevation in the area is to the northwest and below 1220 m. 460 m. Land is mostly bare, and glacial stones frequently cover the ground. The sun can be seen above the horizon in Thule from 24 April through 21 August with total darkness from 22 November through 24 January. Snowfall and strong winds may occur every month. Temperature decreases, snowfall, and wind speed increase with elevation.