Determining the normal rainy season in Indonesia based on the frequency of basic rainfall
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Abstract
Generally climatologists decide a climatological normal from a 30 years average of climate elements. BMKG also use the same method to generate climatological normal for onset of season, using the average of each decadal (10 days) rainfall cumulative in 30 years period. In this assessment climatological normal for onset of season is determined by the frequency of 50 mm rainfall for each decadal. The result is then compared to the climatological normal from decadal rainfall average. Generally the conclusions of this assessment are: with the frequencies distribution the central tendency of climatological normal for the onset of season periodically are look more clearly than climatological normal by the average, then the climatological normal generated by frequency method gives smaller deviation of actual season onset and the dry season period by frequency is longer than using the average method
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