CDO

Hm, without the files it is hard to say what is going wrong. Which CDO version are you using? Can you upload the output of ncdump for both files or best the files?

Hello, unfortunately the ncdump of the ERA5 file is 2.5G so I can't upload it. If you think it's necessary I can try to extract just one hour from each of the datasets and upload that.

CDO version 2.4.0, Copyright (C) 2002-2024 MPI für Meteorologie
This is free software and comes with ABSOLUTELY NO WARRANTY
Report bugs to <https://mpimet.mpg.de/cdo>

The output of

ncdump -h ERA5_data.nc 
ncdump -h precip.nc

shouldn't be that big.

But you can extract one timestep from each file and upload them.

ncdump -h precip.nc
netcdf precip {
dimensions:
time = UNLIMITED ; // (24 currently)
lon = 700 ;
lat = 500 ;
variables:
double time(time) ;
time:standard_name = "time" ;
time:units = "seconds since 1980-01-06 00:00:00 UTC" ;
time:calendar = "gregorian" ;
time:axis = "T" ;
float lon(lon) ;
lon:standard_name = "longitude" ;
lon:long_name = "longitude" ;
lon:units = "degrees_east" ;
lon:axis = "X" ;
float lat(lat) ;
lat:standard_name = "latitude" ;
lat:long_name = "latitude" ;
lat:units = "degrees_north" ;
lat:axis = "Y" ;
float precipitation(time, lat, lon) ;
precipitation:units = "mm/hr" ;

// global attributes:
:CDI = "Climate Data Interface version 2.4.0 (https://mpimet.mpg.de/cdi)" ;
:Conventions = "CF-1.6" ;
:source = "Huffman, G. J., Stocker, E. F., Bolvin, D. T., Nelkin, E. J., Tan, Jackson. (2024). GPM IMERG Final Precipitation L3 Half Hourly 0.1 degree x 0.1 degree V07. Research Data Archive at the National Center for Atmospheric Research, Computational and Information Systems Laboratory. https://doi.org/10.5065/SRTD-0R12." ;
:title = "IMERG v7 Final hourly European precipitation" ;
:history = "Thu Jan 16 11:12:55 2025: cdo seldate,2002-01-01 /gws/nopw/j04/bris_climdyn/j_miller/IMERG/FilteredHourlyIMERG_2002-01-01_00:00:00-2002-12-31_23:00:00_latlon.nc /gws/nopw/j04/bris_climdyn/j_miller/IMERG/2002/FilteredHourlyIMERG_2002-01-01.nc\nCreated on 2025-01-15" ;
:description = "IMERG v7 Final half-hourly data filtered by Joshua Miller\nHalf-hourly variables are averaged to hourly time resolution" ;
:CDO = "Climate Data Operators version 2.4.0 (https://mpimet.mpg.de/cdo)" ;
-----------------------------------------------------------------------------------------------------------------------
ncdump -h ERA5_data.nc
netcdf ERA5_data {
dimensions:
time = UNLIMITED ; // (24 currently)
lon = 700 ;
lat = 500 ;
variables:
double time(time) ;
time:standard_name = "time" ;
time:units = "hours since 2002-01-01" ;
time:calendar = "proleptic_gregorian" ;
time:axis = "T" ;
double lon(lon) ;
lon:standard_name = "longitude" ;
lon:long_name = "longitude" ;
lon:units = "degrees_east" ;
lon:axis = "X" ;
double lat(lat) ;
lat:standard_name = "latitude" ;
lat:long_name = "latitude" ;
lat:units = "degrees_north" ;
lat:axis = "Y" ;
float temp850(time, lat, lon) ;
temp850:units = "K" ;
temp850:table = 128 ;
temp850:_FillValue = NaNf ;
temp850:missing_value = NaNf ;
float temp700(time, lat, lon) ;
temp700:units = "K" ;
temp700:table = 128 ;
temp700:_FillValue = NaNf ;
temp700:missing_value = NaNf ;
float temp500(time, lat, lon) ;
temp500:units = "K" ;
temp500:table = 128 ;
temp500:_FillValue = NaNf ;
temp500:missing_value = NaNf ;
float temp250(time, lat, lon) ;
temp250:units = "K" ;
temp250:table = 128 ;
temp250:_FillValue = NaNf ;
temp250:missing_value = NaNf ;
float vort850(time, lat, lon) ;
vort850:units = "s-1" ;
vort850:table = 128 ;
vort850:_FillValue = NaNf ;
vort850:missing_value = NaNf ;
float vort700(time, lat, lon) ;
vort700:units = "s-1" ;
vort700:table = 128 ;
vort700:_FillValue = NaNf ;
vort700:missing_value = NaNf ;
float vort500(time, lat, lon) ;
vort500:units = "s-1" ;
vort500:table = 128 ;
vort500:_FillValue = NaNf ;
vort500:missing_value = NaNf ;
float vort250(time, lat, lon) ;
vort250:units = "s-1" ;
vort250:table = 128 ;
vort250:_FillValue = NaNf ;
vort250:missing_value = NaNf ;
float specHum850(time, lat, lon) ;
specHum850:units = "kg kg-1" ;
specHum850:table = 128 ;
specHum850:_FillValue = NaNf ;
specHum850:missing_value = NaNf ;
float specHum700(time, lat, lon) ;
specHum700:units = "kg kg-1" ;
specHum700:table = 128 ;
specHum700:_FillValue = NaNf ;
specHum700:missing_value = NaNf ;
float specHum500(time, lat, lon) ;
specHum500:units = "kg kg-1" ;
specHum500:table = 128 ;
specHum500:_FillValue = NaNf ;
specHum500:missing_value = NaNf ;
float specHum250(time, lat, lon) ;
specHum250:units = "kg kg-1" ;
specHum250:table = 128 ;
specHum250:_FillValue = NaNf ;
specHum250:missing_value = NaNf ;
float relHum850(time, lat, lon) ;
relHum850:units = "%" ;
relHum850:table = 128 ;
relHum850:_FillValue = NaNf ;
relHum850:missing_value = NaNf ;
float relHum700(time, lat, lon) ;
relHum700:units = "%" ;
relHum700:table = 128 ;
relHum700:_FillValue = NaNf ;
relHum700:missing_value = NaNf ;
float relHum500(time, lat, lon) ;
relHum500:units = "%" ;
relHum500:table = 128 ;
relHum500:_FillValue = NaNf ;
relHum500:missing_value = NaNf ;
float relHum250(time, lat, lon) ;
relHum250:units = "%" ;
relHum250:table = 128 ;
relHum250:_FillValue = NaNf ;
relHum250:missing_value = NaNf ;
float u-wind850(time, lat, lon) ;
u-wind850:units = "m s-1" ;
u-wind850:table = 128 ;
u-wind850:_FillValue = NaNf ;
u-wind850:missing_value = NaNf ;
float u-wind700(time, lat, lon) ;
u-wind700:units = "m s-1" ;
u-wind700:table = 128 ;
u-wind700:_FillValue = NaNf ;
u-wind700:missing_value = NaNf ;
float u-wind500(time, lat, lon) ;
u-wind500:units = "m s-1" ;
u-wind500:table = 128 ;
u-wind500:_FillValue = NaNf ;
u-wind500:missing_value = NaNf ;
float u-wind250(time, lat, lon) ;
u-wind250:units = "m s-1" ;
u-wind250:table = 128 ;
u-wind250:_FillValue = NaNf ;
u-wind250:missing_value = NaNf ;
float v-wind850(time, lat, lon) ;
v-wind850:units = "m s-1" ;
v-wind850:table = 128 ;
v-wind850:_FillValue = NaNf ;
v-wind850:missing_value = NaNf ;
float v-wind700(time, lat, lon) ;
v-wind700:units = "m s-1" ;
v-wind700:table = 128 ;
v-wind700:_FillValue = NaNf ;
v-wind700:missing_value = NaNf ;
float v-wind500(time, lat, lon) ;
v-wind500:units = "m s-1" ;
v-wind500:table = 128 ;
v-wind500:_FillValue = NaNf ;
v-wind500:missing_value = NaNf ;
float v-wind250(time, lat, lon) ;
v-wind250:units = "m s-1" ;
v-wind250:table = 128 ;
v-wind250:_FillValue = NaNf ;
v-wind250:missing_value = NaNf ;

// global attributes:
:CDI = "Climate Data Interface version 2.4.0 (https://mpimet.mpg.de/cdi)" ;
:Conventions = "CF-1.6" ;
:institution = "European Centre for Medium-Range Weather Forecasts" ;
:history = "Wed Jan 15 13:53:42 2025: cdo remapnn,IMERG_grid.txt ...: cdo remapnn,target_grid.txt ...: ncatted -a units,lon,o,c,degrees_east ...: cdo -f nc copy era5.grib era5.nc" ;
:NCO = "netCDF Operators version 5.2.7 (Homepage = http://nco.sf.net, Code = http://github.com/nco/nco, Citation = 10.1016/j.envsoft.2008.03.004)" ;
:CDO = "Climate Data Operators version 2.4.0 (https://mpimet.mpg.de/cdo)" ;

Can you upload one timestep per file?