You should ask  the administrator of Persiann for the extistence of any rainfall map for Persia and eventually why a name does not correspond to content, am alternative is scouting a web general database at Ibrid https://iridl.ldeo.columbia.edu/docfind/facetedbrowser.html?taxa=iridl%3AMaproom_Search&itemClass=iridl%3Amap_room

I neabt IRI and system Ingrid, but PERSIANN (Precipitation Estimation from Remotely Sensed Information using Artificial Neural Networks) hols only the data you saw already, best wishes

Dear Guido and Arash,

Many thanks for your kindness. I could find the Persiann-CCS database in the link below:

http://chrsdata.eng.uci.edu/