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Count longest consecutive run of zeros

  1. #1
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    Count longest consecutive run of zeros

    I have a spreadsheet with daily rainfall data listed in column A. I want to find the longest period of no rainfall - I used to have a spreadsheet somewhere that used an array formula in a column next to the rainfall data and it counted the number of consecutive zero days, so I know it's possible! Can't for the life me remember the formula I used though.

    Example: in column A (daily rainfall data) there is:

    0.5, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 1.5 etc

    So in column B this would read as:

    0, 1, 2, 0, 1, 2, 3, 0

    etc, i.e. basically counting the number of zeros in column A, adding them up until a non-zero is found and starting again.

    Thanks in advance

  2. #2
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    Re: Count longest consecutive run of zeros


    I'm sure they'll be a much neater (and non-array) solution, but, assuming your list starts in A2, enter this array formula in B2 and copy down as required:


    Click * below if this answer helped

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