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monthly mean for each month and each year in the data frame

Thank you again.
I finally used aggregate because it build a data frame straight away.

Stefano

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Stefano Sofia PhD
Civil Protection - Marche Region
Meteo Section
Snow Section
Via del Colle Ameno 5
60126 Torrette di Ancona, Ancona
Uff: 071 806 7743
E-mail: stefano.sofia at regione.marche.it
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