I was confused by two things - not fully intuitive output format, but beauty is in the eye of the beholder and third "running 3m average" of the example (why 233?), but later saw 230 in the Output.
As a result - twin Browse tool -) and different order of Name column values that easily tuned by ordering in the Join Multiple tool.
There's probably a better way to do this than my solution as mine feels static. If a user later needs 9 or 12 months rolling you'd be back here adding or adjusting formulas...
