CenTrends v1.0 extended with CHIRPS-2.0 merged satellite / rain gauge precipitation estimate
X axis: regular grid with 104 0.25° steps, first point at 28.13° E, last point at 53.88° E
Y axis: regular grid with 132 0.25° steps, first point at 14.88° S, last point at 17.88° N
Z at 0.00
Monthly data available from Jan1900 to Dec2018 (1428 months)
Variable precip (CenTrends Greater Horn of Afica precipitation v1.0) in mm/day
Full metadata.

Get grid points, average area or generate subset

Mask:	no mask mask3.txt   add a mask to the list
Latitude:	°N - °N
Longitude:	°E - °E
Boundaries:	halfway grid points interpolated
Make:	average max min set of grid points subset of the field
Demand at least:	% valid points in this region

Create a field with lower time resolution

New time scale:	annual (Jul-Jun) annual (Jan-Dec) biannual seasonal
New variable:	mean sd sum sum above sum below number min time of min max time of max first time last time of precipitation
Threshold:	no cut less than greater than mm/day percentile normal 1971-2000
Minimum:	% valid data
First apply:	-month running mean
Missing data:	ignore, climatology, trend, persistence.

Create a field with lower spatial resolution

Average over blocks of longitude and latitude grid cells

Construct a statistical forecast model from this field

Please consider downloading this field from the authoritative site.
If you really want to get it here, CenTrends/CHIRPS precipitation is available as a netcdf file (size 40.7848 MB).