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exceldatetimestampexcel-2007average

Daily and Hourly Averages from (m/d/yyyy h:mm) timestamps in Excel

I have an Excel 2007 spreadsheet with date entries in this format m/d/yyyy h:mm (one cell). I would like find the hourly and daily average of all the columns of this spreadsheet and save each time aggregation to a new worksheet.

The data is recorded every ~10 minutes, but throughout the dates of data collection there was some time slips. Not every hour has the same number of rows. Also, the ending minute is either 0 or 6 depending on the time correction.

What would be a good way to approach this task within Excel 2007? It seems like this might be possible with a pivot table if I can create a formula that will select the correct range for the timestamps. Thanks.

For example, an date time entry in TIMESTAMP, 10/31/2012 0:06 which is in one cell.

TIMESTAMP Month Day Year Hour Min Rain_mm Rain_mm_2 AirTC AirTC_2 FuelM FuelM_2 VW ... there are ~16 variables (total) after the data time
10/31/2012 0:06 10 31 2012 0 06 0 0 26.11 26.08 2.545 6.4 0.049
10/31/2012 0:16 10 31 2012 0 16 0 0 25.98 25.97 2.624 6.6 0.049
10/31/2012 0:26 10 31 2012 0 26 0 0 24.32 23.33 2.543 6.5 0.048
10/31/2012 0:36 10 31 2012 0 36 0 0 24.32 23.33 2.543 6.5 0.048
10/31/2012 0:46 10 31 2012 0 46 0 0 24.32 23.33 2.543 6.5 0.048
10/31/2012 0:56 10 31 2012 0 56 0 0 25.87 25.87 2.753 7.3 0.049
10/31/2012 1:06 10 31 2012 0 06 0 0 25.74 25.74 2.879 8.1 0.051
## The above is just over one hour of collection on one day ##
...    
## Different Day ### Notice Missing Time Stamp
11/30/2012 0:00 11 30 2012 0 06 0 0.1 26.12 26.18 2.535 6.4 0.049
11/30/2012 0:10 11 30 2012 0 16 0 0.1 25.90 25.77 2.424 6.6 0.049
11/30/2012 0:20 11 30 2012 0 26 0.1 0.2 24.12 24.43 2.542 6.4 0.046
11/30/2012 0:30 11 30 2012 0 36 0.1 0 24.22 22.32 2.543 6.5 0.048
11/30/2012 0:50 11 30 2012 0 56 0.1 0.2 26.77 25.87 2.743 6.3 0.049
11/30/2012 1:00 11 30 2012 0 06 0 0 24.34 24.77 2.459 5.1 0.050
## so forth on so on ##
Solution

  • After clarification of the requirement for daily averages edited to cover both daily and hourly averages:

    1. Add a column (here B) for ‘H’ (ie hour) with =HOUR(A2) copied down.

    (Note: Though formatted to show only m/d/y content of ColumnA is, in line with title, assumed to be all of mm/dd/yyyy hh:mm. Makes existing columns [with names jumbled] Month, Day, Year, Hour redundant).

    1. Select data range.
    2. Data, Subtotal, At each change in: TIMESTAMP, Use function: Average, Add subtotal to: check only columns G and to the right, OK.
    3. Uncheck Replace current subtotals in Subtotal and apply At each change in: H, Use function: Average, and Add subtotal to: as before, OK.
    4. Replace =SUBTOTAL(1, in Min column with =MIN( .
    5. Delete ‘spare’ Grand Average row.
    6. Reformat as required.

    Hopefully this will be achieved and is what is required!:

    SO13731807 example

    Note midnight 'tonight' is counted as within first hour of tomorrow.