How to get the average data of acummulated precipitation

Question

I'm really new to this CDO thing and I feel awkward.

I have been working with netcdf files that have daily precipitation data and I would like to perform these calculations with CDO

• First calculate the moving sum of precipitation using a 5-day window.

-Then calculate the annual maximum of the sliding sum for each year.

-And finally, calculate the 20-year average of those values

Answer 1

So if I understand correctly you want the average rainfall for 5 specific days of the year over a 3 year period?

Well the answer is to take the time mean, not annual yearmean

cdo timmean in.nc out.nc

But... If you don't me saying it seems a very strange thing to do. It reminds me of the famously infamous paper that tried to work out the impact of aviation on climate by comparing the 5 days post 9/11 with the same 5 days the year before!

Maybe if you edit the question to include more of the science and justification for calculating this we can help further.

Answer 2

Assuming everything is in a single file, the following approach, where all 3 calcs are chained, should work:

cdo -timmean -yearmax -runsum,5 infile outfile