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

This dataset has bytes (2.6507059E08 252.79102MB) 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