NOAA NCDC DAILY GLOBALSOD mean sea_level pressure 10450 Data Files

This dataset has bytes (8760 0.008354187MB) of data in it, which should give you a rough idea of the size of any file that you ask for. WMO40

Data restricted by WMO Resolution 40

The following data and products may have conditions placed on their international commercial use. They can be used within the U.S. or for non-commercial international activities without restriction. Re-distribution of these data by others must provide this same notification. A log of IP addresses accessing these data and products will be maintained and may be made available to data providers.

For details, please consult:

http://www.wmo.ch/web/pla/Res40Cg-XII.doc