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  1. #1
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    daily to semi-monthly (2002 xp)

    I have 105 years of daily precipitation data which I would like to sum as 14 day totals; e.g. 2002 would have days 1-14 as period 1, days 15-28 as period 2, days 29-42 as period 3 etc. for a total of 26 periods for each year. I could do a convoluted vlookup table to convert a "day of the year" column to the correct period. Is there a better way?
    Thanks!

  2. #2
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    Re: daily to semi-monthly (2002 xp)

    I do this kind of thing using subtotals, see attached sheet.

    jim

  3. #3
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    Re: daily to semi-monthly (2002 xp)

    Hi,
    You could also do this with a pivot table, grouping the date field by 14 days.
    HTH.
    Regards,
    Rory

    Microsoft MVP - Excel

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