=AVERAGE(IF((A1:A10<MAX(A1:A10))*(A1:A10<MIN(A1: A10)),A1:A10))

which is an array formula, it should be committed with Ctrl-Shift-Enter, not
just Enter.
Excel will automatically enclose the formula in braces (curly brackets), do
not try to do this manually.
When editing the formula, it must again be array-entered.

This will not work if there is more than one of the MAX/MIN.

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HTH

Bob

(there's no email, no snail mail, but somewhere should be gmail in my addy)



"leadfoot" wrote in message
...
I've tried Excel help and played around with formulas, and I can't find
anything for what should be a pretty simple issue: I want to calculate
averages on a series of values for each month, while discarding the
highest
and lowest values.

Perhaps I just didn't word it right when using Excel help, but no results
were helpful ...

Thanks!