Average columns of data based on values in another column

original_question.xlsx

A solution to a similar question to this one has previously been provided:
https://www.experts-exchange.com/questions/29094062/Lookup-data-based-on-values-in-another-column.html

This time, what is needed is the average value of the 30 years of "n" data leading up to and including the year listed in the "year" field (Column B). This result should be included in the "n_30yr_avg" field (Column C).

The first 52 values for "n_30yr_avg" have been solved manually in the attached worksheet.

Is there a solution that would provide this calculation for all records?
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dougf1rAsked:
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dougf1rAuthor Commented:
File is now embedded
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Ejgil HedegaardCommented:
You can use this formula
=SUMPRODUCT((RIGHT($D$1:$BJ$1,4)*1>B2-30)*(RIGHT($D$1:$BJ$1,4)*1<=B2)*D2:BJ2)/30

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dougf1rAuthor Commented:
Works great, many thanks!
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