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Anomalies

By checking this box you instruct the system to subtrcat the seasonal
cycle before doing the computations. For monthly data, this implies
that the mean of all January values is composed and subtracted from
the individual January values, the mean of all Februaries is
subtracted from the February values, etc. For other time scales a
similar procedure is followed. The seasonal cycle is not smoothed.
This page is part of the help system of the KNMI Climate Explorer