NOAA/PSL Catalog https://psl.noaa.gov/thredds/catalog/Datasets/gpcp/v2.2/catalog.html

Dataset Size Last Modified
     Folder  v2.2   --
         precip.mon.1981-2010.ltm.nc 750.7 Kbytes 2017-01-06T21:13:46Z
         precip.mon.ltm.nc 750.7 Kbytes 2018-02-14T16:58:03Z
         precip.mon.mean.error.nc 14.61 Mbytes 2018-02-14T16:57:58Z
         precip.mon.mean.nc 15.20 Mbytes 2018-02-14T16:57:52Z

NOAA/PSL at NOAA PSL see Info
THREDDS Data Server [Version 4.6.15-SNAPSHOT - 2020-01-28T04:01:10+0000] Documentation