average over a state

Does anyone know a trick to average a variable over a specific US state?
For example, I have a 0.1 degree dataset of Midwest temperatures and
want to compute the average temperature over Wisconsin only (carefully
within its state boundaries).

Probably there's no good way but I might as well ask.

Thanks, Mike
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Received on Tue Apr 07 2009 - 13:05:46 MDT