Trending in graphs

I would like to see trends as well as current values in the graphs.

Example: Viewing a graph for CPU utilization on Tuesday between 1 and 5. I want to see what the "normal" util is by viewing the average of the past 5 Tuesdays between 1 and 5. I am doing this currently with home-grown scripts and rrdtool, but we want to get away from home-grown tools as a company. I've tried to attach one of my trend graphs.

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