Trend of SST for each month

Hi,

I have monthly SST values from which I want to calculate trend of average
SST(so that I have one value for the whole region and I get a XY plot)
over the Equatorial Pacific for each of the twelve months separately.
Can anybody please help me.

Thanks,
Soumik

-- 
*************************************
Soumik Basu
Graduate Student, Research Assistant
International Arctic Research Center
University of Alaska Fairbanks
Fairbanks,Alaska,USA
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