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All-India Monsoon Index

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Indices india summer monsoon rainfall
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 be obtained using only 36 observations.

Reference

Sontakke, N.A. , G.B. Pant, and N. Singh 1993, "Construction of all-India summer monsoon rainfall series for the period 1844-1991, J. Clim., 6, 1807-1811.