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First we state that the separation of the trend/season component on one side and of the auto-correlation structure on the other side is crucial in our analysis. With regard to the latter: handling the detrended series or the differenced series by ARMA-type models was worked out in Chaps. 4 and 5. It should be mentioned that we have both aspects in mind, the modeling of the observed series and the predicting of climate values in the near future.