What kind of timeseries are you looking for? For a spesific point or region, or for whole region average? If you want to obtain timeseries data of the average of whole data, the you should use "cdo -outputtab,date,time,value -fldmean INFILE.nc | awk 'FNR==1{ row=$2","$3","$4;print row } FNR!=1{ row=$1","$2","$3; print row}' > OUTFILE.csv". In that, "-fldmean" takes the spatial average of data and other part gives you csv output that contains date, hour and value.