With months in A2 to A9, and values in B2 to B9, try this:
=INDEX(A2:A9,MATCH(MAX(B2:B9),B2:B9,0))
If you have duplicate max values, this formula will return the month of the
*first* max value.

Signature
HTH,
RD
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Please keep all correspondence within the NewsGroup, so all may benefit !
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> Let's say I have a table:
>
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>
> Thanks.