This dataset depends on the following independent variable (i.e, grid):
grid: /T (months since 1960-01-01) periodic (0000 1 Jan) to (2359 20 Dec) by 0.333333 N= 36 pts :grid
so there will be 36 links below for the different files.
You may want to get a utility like wget which can download sets of files. For example (all one line)
wget -r -l2 -nd --no-parent -e robots=off -v --relative 'http://digilib.icpac.net/SOURCES/.ENACTS/.version0/.dekadal/.rainfall/.rfe_merged_vs_meanrfe_merged/%255BT+%255Dminover/%255BX+%255Daverage/Y+integral/Y+partial/T+integral/%5BT+%5Ddetrend-bfl/yearly-climatology/downloadsarcinfo.html'
single quotes are necessary in unix to protect the url from expansion; probably necessary in other cases as well