These refer to the total daily volume on an average day.  These do not use the current day’s volume.  These look at the previous 5 days, 10 days, or 3 months of history.

Note:  Traditionally the server always looked at 10 days of history.  The other versions of the filter are relatively new.

More information about volume:
Fatal error: Uncaught Error: Call to undefined function video_help() in /var/www/alldocs/home/sdoehner/webtest/help/templates/filter_content/Vol5D.html:11 Stack trace: #0 {main} thrown in /var/www/alldocs/home/sdoehner/webtest/help/templates/filter_content/Vol5D.html on line 11