 

Field
CPC daily precipitation
NCEP/CPC daily analysis
X axis: whole world in 720 0.50° steps, first point at 0.25° E, last point at 359.75° E Y axis: regular grid with 360 0.50° steps, first point at 89.75° S, last point at 89.75° N 1daily data available from 01Jan1979 to 31Dec2017 ( 14274 times) Variable prcp (prcp) in mm/dy Construct a statistical forecast model from this field Compute zonal mean
If you really want to get it here, CPC daily precipitation is available as a netcdf file (size 3806.73 MB). 
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