Fairly detailed rainfall data, taken mainly during one year, form the basis for an examination of the character of the dry- and wet-season rainfall at Guam. Distribution charts of the rainfall show the importance of the topography and the relation of the rainfall patterns to the direction and persistence of the low-level flow. Time curves of the mean rainfall of the island illustrate the large day-to-day variability and point to the importance of synoptic disturbances. The frequency, duration and intensity of rain during the two seasons, as well as diurnal variations in these quantities, are also examined.

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1 This report is based on research conducted on Office of Naval Research contracts while the author was employed by the University of Chicago.