Filter visual without filtering data

Hi v-cherch-msft,

Thanks for the reply, I'll add a more detailed description and sample data/report.

The data I have is temperature data for New Zealand for serval weather station across the country updated every hour for the past several years.

I have another table of GXP's, grid exit points (nodes where electricity leaves the distribution grid and is then sent to residences and businesses), and each GXP is assigned a weather station.

Another table I have assigns each GXP to one of 14 grid zones accross the country.

Using this I have created a measure using a disconnect date table to calculate the 3 year average for a selected month by take the average for the same month from the previous 3 years. 

So what I have so far this 3 year average for each month, and I want to use it as a constantline for each month, so I will have graphed each days actual temp with this constant line temp so as to compare variance.
Crappy paint mock up.

So I eventally want to be able to select a region and a month.

I was think of adding an extra column to my temperature data that checks the month and weather station and then calculates an average for that month, but with 40ish stations and  and each month being different, Im not sure how I go about this.

Heres a copy of the report currently:
https://drive.google.com/open?id=10Q-dJUaazkWb6gfrhb-hUuZkLEUMA0Wx