Azores on the island of Pico, is the highest point in Portugal, at . If measured from their base at the bottom of the ocean to their peaks, which thrust high above the surface of the Atlantic, the Azores are actually some of the tallest mountains on the planet. The climate of the Azores is very mild for such a northerly location, being influenced by its distance from the continents and by the passing Gulf Stream. Due to the marine influence, temperatures remain mild year-round. Daytime temperatures normally fluctuate between and depending on season. Temperatures above or below are unknown in
Aviation in the Azores of air-sea bases would close the "Azores Gap", and provide a secure blanket for the North Atlantic. The sudden attack at Pearl Harbour by Imperial Japanese forces resulted in a review of Portuguese guidelines, paralysing the working group. A ship (the Portuguese "Mirandela") shipped 30 Gloster SS37 Gladiators and five Junkers Ju 52 monoplanes, as well as support equipment and personnel, were sent to the Azores (departing on 4 June 1941). Fifteen of the Gloster Gladiators and five Ju 52s were deposited in São Miguel at Air Base 4, for the 1st Expeditionary Fighter Squadron, while the remaining planes were