I'm not sure that I quite caught the gist, but please see if the below could give ideas.
I joined my daily and monthly tables on region alone.
Then to filter out unneeded combinations, I made of filter of:
Then I plotted the two vaules using the MeasureName/MeasureValue method
and got them all to plot together and continuously.
Please see workbook v10.3 attached in the Forum Thread.
If this does not replicate your scenario,
please adjust the attached workbook and spreadsheet to more closely match yours.
277728month.twbx 52.0 KB