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[ferret_users] monthly abnormal



Dear all,
  I have a  model monthly mean temperature ouput from 1980~2007 stored in one netcdf file.I want to get the monthly abnormal(that is every Jan temperature minus the average value of all Jan temperature from 1980-2007 )
How to achieve it using ferret?
 
This is the content of the file
netcdf np908_monthly_sst {
dimensions:
        time = UNLIMITED ; // (336 currently)
        lat = 301 ;
        lon = 307 ;
variables:
        float lat(lat) ;
                lat:units = "degrees_north" ;
        float lon(lon) ;
                lon:units = "degrees_east" ;
        float time(time) ;
                time:units = "months since 1980-01-01 00:00:00" ;
                time:time_origin = "01-jan-1980 00:00:00" ;
                time:modulo = " " ;
        float sst(time, lat, lon) ;
                sst:missing_value = 32767.f ;
data:
.................
 
 
 
Thank you in advance.
 
Xia

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