area averaging for climatology

[Teddy Allen]

Dear GrADS users,
I am trying to compute a single value for SST in a particular region for
an averaged time period. Ideally, I would like to average a region and
then compute the values of that single region for Jan. of 1982-2007 (set t
2 302 12)....
Is it possible to compute a single spatially averaged value of SST during
a temporally averaged  time period? I understand how to do them
individually, but together I am confused. I am trying to average a sst in
the NINO3 region for all January months in the 1982-2007 Reynolds 1x1
degree SST dataset. I expect to find one SST that defines the average Jan.
temp within that region from 1982 to 2007. ( While this may not be
pertinent to anything of significance, it should provide a template to use
in other more meaningful applications...)

I have entered:
define nino3 = aave (sst, lon=210, lon=270, lat=-5, lat=5)
define janino3 = ave(nino3, t=2, t=302, 12)
d janino3

Thank you for any advice or direction.
teddy