[gradsusr] Change of month

[Miquel Bernis]

Hi everyone,

I'm stucked in a problem that might be simple to fix, maybe any of you
could help me. The point is that I can't operate with files when there's
change of month. I'm working with GFS 0.25, and when I try to sum the rain
of the last file of month with the rain of the first file of the moth
ahead, it returns and error like this:

Invalid grid coordinates
World coordinates convert to non-integer  grid coordinates
Variable = apcpsfc  Dimension = 3

Has any of you a solution for that?
Thank you very much.
I'll really appreciate your help.

Miquel
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