Iloilo (Panay Islands) and Manila (Luzon Island) represent the tropical monsoon climates of the central and northern islands respectively.
The near-equatorial climate of the southern islands is represented by Surigao and Zamboanga. Surigao is on the eastern side of Mindanao Island while Zamboanga is on the west side.
These four Philippines cities are all excellent sites for water-from-air machines with Water-from-Air Resource Annual Indices ranging from 1.33 to 1.43.