welcome to the forum, Curt. you can try this array formula in P4:
you mentioned 3 consecutive months & 2 occurrences of 2 consecutive months. so i did exactly that. if you want 3/2 or more, then add in the > sign like this:
...confirmed by pressing CTRL+SHIFT+ENTER to activate the array, not just ENTER. You will know the array is active when you see curly braces { } appear around your formula. If you do not CTRL+SHIFT+ENTER you will get an error or a clearly incorrect answer. Press F2 on that cell and try again.
a merry Christmas to you in advance!
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