A study of trends and periodicities in the seasonal and annual rainfall of India
Keywords:rainfall of India, statistical techniques, southwest monsoon
The seasonal and annual rainfall of India for each year of the 60-year period from 1901 to 15 to1960 have been studied by subjecting them to the latest statistical techniques. This analysis has brought out that the mean annual rainfall is of the order of l19cm with a standard deviation of 9.5cm. Fisher's statistics have shown that the frequency distribution of time series of seasonal and annual rainfall are normal. Significant increase of 5 percent in 30years' mean is observed in the southwest monsoon and the annual rainfall but the increase of 6 per cent in the post monsoon rainfall is not statistically significant. Power spectrum analysis has revealed the presence of 2.3 to 2.5 years' cycle and a weak cycle of about 10.15 years.
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