I'm trying both of the methods above but I'm still having trouble, maybe I'm just not understanding something. I think part of the problem is that my rasters don't have a column for year or date because they don't have attribute tables. In order to generate attribute tables I would have to change all the values to integer, and that wouldn't be good.
I'm working with a bunch of individual rasters with the same extents that show precipitation values across the globe, if that helps at all.
Thanks,
Scott