MONTHLY PRECIPITATION DISTRIBUTION: A COMPARATIVE INDEX

Modification of the Gibbs-Martin Index of Employment Diversification permits derivation of a precipitation concentration index (PCI) that characterizes the monthly concentration of precipitation on a scale that ranges from less than 10 for evenly distributed rainfall to 100 for extreme monthly rainfall distribution. The defined lower and upper limits of the index contrast to other statistical descriptions of precipitation distribution, which are open-ended. Mapped values of the PCI provide a good visual guide to relative monthly distribution of precipitation. Suggested applications of the index are related to both pedagogic and research applications.