VBA - Summing Values That Have Shared Cell Value

I am trying to write some code to sum all values from a given range, where the Month matches i.e. = "Jan" and where another cell = "Yes".

Ideally the code would be flexible as to the Month value, as this list already exists on the spreadsheet, so it can be looped through. Here is an example of my spreadsheet data that I use:

Month
Stock Cost
Invoiced?

Jan
£60.00
Yes

Jan
£50.00
Yes

I'd like the code to loop through all rows where month = set value, and only sum those values if column Invoiced? = "Yes".

Sub CalcReleaseCost()
Dim StockCost As Range
Dim Month As Range
Dim Invoiced As Range
Dim MonthTotal As Variant
Dim x As Range

[Code] ........