NOAA/PSL Catalog https://psl.noaa.gov/thredds/catalog/Datasets/gpcc/first_guess/catalog.html

Dataset Size Last Modified
     Folder  first_guess   --
         precip.first.mon.total.1x1.nc 26.96 Mbytes 2020-09-28T21:17:21Z

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