LICENSE:
The data and metadata within the Global Historical Climatology Network - Daily Version 1.0 are governed by the following:
"The following data and products have conditions placed on their commercial use. The non-U.S. data cannot be redistributed within or outside of the U.S. for any commercial activities."
For details, please consult:
http://www.wmo.ch/web/pla/Res40Cg-XII.doc