NOAA NCEP-NCAR CDAS-1 MONTHLY Intrinsic PressureLevel psi Data Files

This dataset has bytes (5.6327501E08 537.18091MB) of data in it, which should give you a rough idea of the size of any file that you ask for.

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ingrid	The Postscript-based software on which the Data Library is built.
CPT	Climate Predictability Tool More information
ferret	Interactive computer visualization and analysis software. More information
GrADS	Grid Analysis and Display System More information
matlab	Data analysis and visualization software. More inf