Hi ,user     I used  mon-ATM for  1month average but there is a messege:     I change only year in file.    PGFIO-F-253/unformatted read/unit=10/attempt to read non-existent record (direct access).    File name = ATM.19900101    unformatted, direct access   record = 1   In source file mon_ATM.f, at line number 45   where is the problem?   can i do other way for 3month mean? thanks