This dataset depends on the following independent variable (i.e, grid):
grid: /T (months since 1960-01-01) periodic [ (21-30 Dec) (0000 11 Jan - 2359 20 Jan) (2359 20 Jan - 2359 30 Jan) (2359 30 Jan - 2359 10 Feb) (2359 10 Feb - 2359 20 Feb) (2359 20 Feb - 2359 30 Feb) (2359 30 Feb - 2359 10 Mar) (2359 10 Mar - 2359 20 Mar) (2359 20 Mar - 2359 30 Mar) (2359 30 Mar - 2359 10 Apr) (2359 10 Apr - 2359 20 Apr) (2359 20 Apr - 2359 30 Apr) (2359 30 Apr - 2359 10 May) (2359 10 May - 2359 20 May) (2359 20 May - 2359 30 May) (2359 30 May - 2359 10 Jun) (2359 10 Jun - 2359 20 Jun) (2359 20 Jun - 2359 30 Jun) (2359 30 Jun - 2359 10 Jul) (2359 10 Jul - 2359 20 Jul) (2359 20 Jul - 2359 30 Jul) (2359 30 Jul - 2359 10 Aug) (2359 10 Aug - 2359 20 Aug) (2359 20 Aug - 2359 30 Aug) (2359 30 Aug - 2359 10 Sep) (2359 10 Sep - 2359 20 Sep) (2359 20 Sep - 2359 30 Sep) (2359 30 Sep - 2359 10 Oct) (2359 10 Oct - 2359 20 Oct) (2359 20 Oct - 2359 30 Oct) (2359 30 Oct - 2359 10 Nov) (2359 10 Nov - 2359 20 Nov) (2359 20 Nov - 2359 30 Nov) (2359 30 Nov - 2359 10 Dec) (2359 10 Dec - 2359 20 Dec) (2359 20 Dec - 2359 30 Dec)] :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/T+integral/X+differences/yearly-climatology/T+partial/downloadsarcinfo.html'
single quotes are necessary in unix to protect the url from expansion; probably necessary in other cases as well