Try this one
You don't need Ctrl+Shift+Enter for this formula
=SUMPRODUCT(($A$2:$A$19<>"")*(TEXT($B$2:$B$19,"mmmm")=TEXT(A24,"mmmm"))/COUNTIF(A$2:A$19,$A$2:$A$19&""))
Try this one
You don't need Ctrl+Shift+Enter for this formula
=SUMPRODUCT(($A$2:$A$19<>"")*(TEXT($B$2:$B$19,"mmmm")=TEXT(A24,"mmmm"))/COUNTIF(A$2:A$19,$A$2:$A$19&""))
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