ORNL DAAC Catalog https://thredds.daac.ornl.gov/thredds/catalog/ornldaac/995/catalog.html

Dataset Size Last Modified
     Folder  ISLSCP II Global Precipitation Climatology Centre (GPCC) Monthly Precipitation   --
         Folder  half_degree/   --
         Folder  one_degree/   --

ORNL DAAC TDS at ORNL DAAC see Info
Documentation