CDO

in case the version matters:

cdo -V
Climate Data Operators version 2.5.0 (https://mpimet.mpg.de/cdo)
System: x86_64-conda-linux-gnu
....
CDI library version : 2.5.0
cgribex library version : 2.3.1
ecCodes library version : 2.44.0
NetCDF library version : 4.9.3 of Sep 15 2025 22:55:31 $
exse library version : 2.0.0
FILE library version : 1.9.1

Due to the fact of a missing varsmedian operator I guess you have to use a workaround (but maybe I miss something). I wrote a short shell script that converts the GRIB file to netCDF, splits the variables into single files, so we are able to use ensmedian here.

#!/bin/bash

infile=$HOME/Downloads/icon-eu-eps_europe_icosahedral_single-level_2025110300_072_snow_gsp.grib2

varname=$(cdo -s -t ecmwf showname $infile | sed -e 's/[[:space:]]\+/ /g' | cut -d ' ' -f 2)

cdo -s -f nc -copy $infile infile.nc
cdo -s -splitname infile.nc var_

nens=$(cdo -s showname $infile | wc -w)
for i in $(seq 1 $nens)
do
    if [ $i != 1 ]; then
        ifile=var_${varname}_${i}.nc
        name=$(cdo -s -showname $ifile)        
        cdo -s -chname,${varname}_${i},${varname} $ifile tmp.nc
        mv tmp.nc $ifile
    fi
done

cdo -O -ensmedian var_*.nc outfile.nc

Dear Karin,
thanks for providing this workaround. It is not the elegant solution I was hoping for and I will have to see how I can get this operational in my routine.
If anybody else knows how to do this without splitting the file, most welcome!
Thanks anyway!
Sebastian

Hello Sebastian,

The next CDO release 2.6.0 comes with the operator varsmedian. A prerelease for testing is available on levante:/home/m/m214003/local/bin/cdo.

Cheers,
Uwe

Ciao Uwe,

thank you for your response and for these great news. I am very much looking forward to the new release then!

Best regards
Sebastian