 

Field
IMERG precipitation
GPM Level 3 IMERG Final Daily 0.1 x 0.1 degree Precipitation averaged over 2x 2 grid boxes
X axis: whole world in 1800 0.20° steps, first point at 179.90° W, last point at 179.90° E Y axis: regular grid with 900 0.20° steps, first point at 89.90° S, last point at 89.90° N 1daily data available from 12Mar2014 to 30Apr2019 ( 1880 times) Variable precipitationCal (Daily accumulated precipitation (combined microwaveIR) estimate) in mm/dy Full metadata. Construct a statistical forecast model from this field Compute zonal mean
Compute annual cycle
If you really want to get it here, IMERG precipitation is available as a netcdf file (size 3573.29 MB). 
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