Abstract
Extreme geographic variations in rainfall in Hawaii pose a problem of finding a simple parameter of rainfall which will be descriptive of both rainfall amounts and distribution. With a view to developing such a parameter, regression formulae are developed which relate mean monthly rainfall to mean annual rainfall. Mean monthly rainfall is shown to be the result of two independent factors, general rainfall and orographic rainfall. Each of these two rainfall types has individual annual march curves. The integrated result of these distinctive variations through the year is the observed mean annual rainfall pattern. Having separated the annual march curves of the general rain and orographic rain, the local geographic rainfall distribution patterns appear much more simple and logical than had been previously realized.
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