Daily Average temperature from multiple files

[Meredith Croke]

Hi,
 
I'm hoping someone can help me with this, I have model output at 3 hour
intervals, forecasted for 180 hours.  What I want to do is calculate the
daily average temperature for each day of the forecast period at a
specific latitude/longitude.  I saw on the archive page that I should be
able to just open each ctl file, but the thing is I have one standard
ctl file named gfs.ctl, however the actual data is in separate files (ie
gfs.2006100212f00, 2006100212f03, etc)
 
Thanks in advance for your help!
 
Meredith
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