Hi Dave and welcome to the forum.
Some of the old links will not work because the old forum was targeted by spammers a year or so ago and a new one was set up but the data carry over of course breaks the links.
I think the most likely useful solution would be to use Multi Column Regions for your Month columns and pick the name of the month as an append field for the column. I would also advise creating a calculated field to give you a 'conversion' to month number that you can use for sorting purposes - or some such solution.
Now, have you used MCR before? If not you may have a few more questions along the way. It's not difficult but also people find it not entirely intuitive at first involvement and a little directional help can be useful once you have had a look at it.
Basically if you get a mental image of each column really being a 'page', complete with whatever is to the LEFT of the first column, in the way the Monarch parses the report you will be most of the way there.
V10 includes a function for Column() that can be used with MCR to ID which column the data comes from and will help you to verify the extraction and the month. It's actually provided for other purposes but can be usefully used for verification as well.
Be sure to let us know if you get stuck but especially if it all works out for you.
I assume your profile is correct and you have V10 ...
Table window, data menu, add a calculated field.
In the expression box enter
You should also be able to see the function listed under ALL functions or REPORT functions (first function displayed.)
If not there .... then I'm puzzled.
Edit: Ah, you got there first!
I seem to remember it not appearing in the help. Late addition as I recall, probably slipped through the documentation checks.