Average per day line chart dashboard

I'm looking to graph out the average of "Processor Queue Length" perfmon per day over the last couple of months. I can get the average for that 2 month period, but I want to graph to show the increase in queue over the course of the last couple of months. Essentially my search to see the average of this event looks like this so far (just a simple search): index=perfmon sourcetype="Perfmon:System" counter="Processor Queue Length" | stats avg(Value) as avgnum How can I go about doing this?