This dataset depends on the following independent variable (i.e, grid):
grid: /T (days since 1960-01-01) ordered [ (30 Nov 1960 - 9 Dec 1960) (10-19 Dec 1960) (20-29 Dec 1960) (30 Dec 1960 - 9 Jan 1961) (10-19 Jan 1961) (20-29 Jan 1961) (30 Jan 1961 - 9 Feb 1961) (10-19 Feb 1961) (20 Feb 1961 - 1 Mar 1961) (2-9 Mar 1961) (10-19 Mar 1961) (20-29 Mar 1961) (30 Mar 1961 - 9 Apr 1961) (10-19 Apr 1961) (20-29 Apr 1961) (30 Apr 1961 - 9 May 1961) (10-19 May 1961) (20-29 May 1961) (30 May 1961 - 9 Jun 1961) (10-19 Jun 1961) (20-29 Jun 1961) (30 Jun 1961 - 9 Jul 1961) (10-19 Jul 1961) (20-29 Jul 1961) (30 Jul 1961 - 9 Aug 1961) (10-19 Aug 1961) (20-29 Aug 1961) (30 Aug 1961 - 9 Sep 1961) (10-19 Sep 1961) (20-29 Sep 1961) (30 Sep 1961 - 9 Oct 1961) (10-19 Oct 1961) (20-29 Oct 1961) (30 Oct 1961 - 9 Nov 1961) (10-19 Nov 1961) (20-29 Nov 1961)] :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://maproom.meteorwanda.gov.rw/SOURCES/.NOAA/.NCEP/.CPC/.FEWS/.Africa/.TEN-DAY/.RFEv2/.est_prcp/yearly-climatology/T/%28days%20since%201960-01-01%29streamgridunitconvert/downloadsarcinfo.html'
single quotes are necessary in unix to protect the url from expansion; probably necessary in other cases as well