CDO

Hi,

I have a problem to gather the data. My data daily (each day is a different file), well, I already tried to collect the data together with the operator "copy" for the month of January showing 31 variables and 31 Timesteps. The problem comes when I try to make an average of the data, rather than the hoped would generate a file with only one variable and one Timesteps are generated 31 new times. how could I solve this problem?
I expected to generate a file thus be plotted directly in at some visualization software.

thanks