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Single month average


I have monthly gridded precipitation data in one file and monthly
geopotential height data in another file.  I would like to correlate the
height data with the precipitation data for a specific month (December). I
have looked at the variance.jnl script for assistance.  For all of my
correlations, I get either 1.0 or -1.0 and I know they are not perfectly
correlated.  There seems to be a problem with the averaging prior to
calculating the correlation.  It appears that the average is that of the
entire period from Dec. 1948-Dec. 1954.  I just want the average of the 7
Decembers within that time period.  There should be an easy way to do
this, but I can't seem to figure it out.

If anyone has any suggestions how to single out one month, I would really
appreciate it.

Amy Sundquist

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