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I have a netcdf (.nc) file of 95GB which consisted of daily data for a 50 years period. I tried to process this with ArcGIS (Multidimension tools – MakeNetCDFRasterLayer command) and it was not functioned. Then I tried with QGIS by adding .nc file as a raster layer and ‘save as’ as Gtiff. This also crashed at the middle of the process. .nc file data are in daily basis and I want to create separate monthly raster layers by using daily data. Can someone help me solve this?

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One way to do this would be to use the NCO tools to do the averaging. Something like this should work to do two months:

ncwa -a time -d time,"2010-01-01 01:00","2010-02-01" -O -D 1 $url mean_01.nc
ncwa -a time -d time,"2010-02-01 01:00","2010-03-01" -O -D 1 $url mean_02.nc
ncea -O mean01.nc mean02.nc test.nc

For 50 years, obviously you would do this as a loop using shell or python. Note that NCO can be difficult to build, so definitely check out the binaries page. There is a native Windows build there, in addition to Mac and Linux.

Another way would be to just write a little python program using NetCDF4-Python, since that's included in the ESRI Multidimentional Supplemental Tools

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