q,
you can download an NCO users manual at:
http://www.cgd.ucar.edu/csm/support/Document/manual.shtml
although I don't have a specific example of a seasonal average within a file,
you can see how to use the -d switch to access various dimensions within the
file.
also, dennis's function should work on 4D variables. YOu can see an example
at:
http://www.cgd.ucar.edu/csm/support/Data_P/climo.shtml
sm
******************************************************
Sylvia Murphy EML: murphys AT ucar.edu
NCAR CGD/CAS PHN: 303-497-1720
1850 Table Mesa Dr FAX: 303-497-1333
Boulder, CO 80305
WEB: http://www.cgd.ucar.edu/csm/support/
http://www.cgd.ucar.edu/csm/support/CSM_Graphics/
******************************************************
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