@slolive wrote: Okay, so when I look at the code for the summary table is does say Proc Tabulate. I am attaching a screenshot.    Run the Tabulate code with an Out=SummaryData on the proc statement. This will create a data set with the monthly totals. Use that data to calculate the mean. Note that the summary variables in the dataset will have suffixes such as _sum added to them, so you can't just use the exact same tabulate code. But it shouldn't be horrific.   If we had an actual input data set example we could provide more exact code example. ... View more