Abstract

Three precipitation regions in California are identified, mapped and otherwise described. Four independent sources of precipitation variation were discovered by a P-mode principal components analysis of a covariance matrix and they, plus a fifth dimension of station means, were evaluated by Ward's [14] algorithm in order to arrive at the regionalization. A discussion of the present application of this methodology is also included as it is thought to be a more appropriate procedure than those described by Willmott [16] and others. Data for the study were 120 monthly precipitation totals observed from 1961–1970 at each of 90 randomly chosen stations within California.

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