NOAA Climate Data Record (CDR) of Satellite-Gauge Precipitation from the Global Precipitation Climatatology Project (GPCP) Daily, V1.3
X axis: whole world in 360 1.00° steps, first point at 0.50° E, last point at 359.50° E
Y axis: regular grid with 180 -1.00° steps, first point at 89.50° N, last point at 89.50° S

1-daily data available from 01Oct1996 to 30Sep2018 ( 8052 times)
Variable precip (NOAA CDR of GPCP Satellite-Gauge Combined Precipitation) in mm/dy
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
Units:	convert to mm/day leave in mm/dy

Create a field with lower time resolution

New time scale:	annual (Jul-Jun) annual (Jan-Dec) biannual seasonal monthly 10-daily 5-daily
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/dy percentile normal 1971-2000
Minimum:	% valid data
First apply:	-day 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, GPCP v1.3 precipitation is available as a netcdf file (size 990.527 MB).