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Calculating seasonal means from monthly means

Added by François Roberge over 7 years ago

Hi all,

I have monthly means over multiple years. I would like to calculate the weighted seasonal means according to the number of days per month from those monthly means.

My seasons are DJF (in the same year) MAM JJA and SON.

Is there a cdo operator that I could use that would allow me to define my own seasons?

Thank you.


Replies (3)

RE: Calculating seasonal means from monthly means - Added by Karin Meier-Fleischer over 7 years ago

Hi Francoise,

to compute seasonal means from monthly means the first two month have to be skipped

cdo timselmean,3,2 ifile ofile

To define own seasons have a look at the select operator which has a season parameter

select,season=SEASON

where SEASON is a comma separated list of seasons (substring of DJFMAMJJA- SOND or ANN).

cdo select,season=JFMAM infile outfile

Bye,
Karin

RE: Calculating seasonal means from monthly means - Added by François Roberge over 7 years ago

Hi Karin,

Yes that is right.

However, by doing that way, the means are not weighted properly by the number of days in each month.

timselmean simply does the mean by the number of timesteps.

Thank you,

François

RE: Calculating seasonal means from monthly means - Added by François Roberge over 7 years ago

The operator yearmonmean does it for annual means.

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