0

I want to calculate daily mean of hourly temperature data from ERA5 data for 1975-2005. I have merged the downloaded hourly NETCDF files to create a single NETCDF file containing temperature and total precipitation data for all years. I think "daymean" operator would be suitable for this task but then I see another operator which is "ydaymean" for multi-year data in cdo. How are they both different and do they give different results? In which case using one can be beneficial over the other?

cdo -daymean -selvar,2 metre temperature infile outfile

or

cdo -ydaymean -selvar,2 metre temperature infile outfile
ClimateUnboxed
  • 7,106
  • 3
  • 41
  • 86
Divyam Garg
  • 3
  • 3

1 Answers1

1

daymean is the simply the daily mean, whereas ydaymean gives you the daily mean over all years (the average of all Jan1, the average of all Jan2 etc) - just look at the dates in the output file and don't forget to check the online documentation, it is very well written.

ClimateUnboxed
  • 7,106
  • 3
  • 41
  • 86