finding deviations from the mean

Valentinaampuero So I go the sample files (May-Nov of 2021).  I am attaching the Nov data here. In this file I added a tab (DailyAvg) where I calculate the average for every :15 sec slot for each panel across all the days recorded.  I then calculate the average (col LED) and std (col LEE) for each :15sec slot and added conditional formatting to highlight all the spots <1std (orange) and <2 std (red).  Finally at the bottom I did a count for how many times that particular panel was found to be <1 STD and <2 STD on average.  I hope this might be helpful and can be a template for the other months.  Maybe even collate these summary counts across months for even better indicator of performance across the year.