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basic monthly calculation

Added by Luis Blacutt over 10 years ago

Dear all,

I have a very basic question. I have twice-daily Era interim data, what I would like is to create a single file with 12 times, I tried the following steps

Generate a daily archive with cdo daymean
Calculate the monthly means with cdo monmean
Finally calculate the mean for each month with ymonmean

However when I check the final file, the averages for February and March are exactly the same, on the other hand if I calculate manually the averages, they are different

Am I missing something?

Best regards