Note that if you are interested in VE edits per user
type instead,
http://ee-dashboard.wmflabs.org/graphs/enwiki_ve_hourly_perc_by_user_type
already offers a smoothing option (click the spanner icon on the top
left), which can be set to 24 hours or more.
The 24 hour smoothing can also be set as the default in a new graph if
that's useful to see. That way the viewer wouldn't have to toggle it every
time.