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An all-India summer monsoon rainfall series for the instrumental period of 1844–1991 has been constructed using a progressively increasing station density to 1870, and one that is fixed thereafter at a uniformly distributed 36 stations. The statistical scheme accounts for the increasing variance contributed to the all-India series by the increasing number of stations during the period 1844–1870. An interesting outcome of this study is that a reliable estimate of summer monsoon rainfall over India can he obtained using only 36 observations.
Sontakke et al. (1993) studied this question.