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...s()" but it need to specify a year, so in my case it couldn't work. I need to automatize this for all my files, so it shouldn't depend on the start year. Thanks a lot! -- View this message in context: http://r.789695.n4.nabble.com/how-to-calculate-seasonal-mean-for-temperatures-tp4638639.html Sent from the R help mailing list archive at Nabble.com.