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7<br />
3.5 The rainfall in the south Peninsula at the end of the southwest monsoon<br />
season or the beginning of the northeast monsoon season is mainly in the<br />
interior of the Peninsula; it is also generally in the afternoon, evening or<br />
early part of night. Subsequently, as the season advances, the rainfall is<br />
mainly in the coastal districts of Tamil Nadu and in south Kerala, the interior<br />
districts getting only a little rain.<br />
3.6 In contrast to the southwest monsoon rainfall along the west coast,<br />
where rainfall increases progressively from the coast towards inland upto the<br />
Western Ghats, in the case of northeast monsoon rainfall, even when it is not<br />
associated with a depression or a storm, the heaviest rainfall is along the<br />
coast and the rainfall decreases as we go towards the interior. Such a distribution<br />
in the mean rainfall pattern has already been referred tn Sec. 3.2(ii).<br />
3.7 In general, rainfall is more variable in the coastal districts than in<br />
the interior districts where rainfall is less. In Tamil Nadu, the cc—efficients<br />
of variability are highest in the north coastal districts where the rainfall is<br />
also highest. This feature is in contrast to the general principle that variability<br />
in rainfall is more over areas where the seasonal total is small than<br />
vice versa.<br />
3.8 The distribution of the northeast monsoon rainfall in the south Peninsula<br />
during the 77 year period (1875—1951) is given below*—
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