Can i count the number of months in a specific range

It's called array formula.

An array formula is a formula that works with an array, or series, of data values rather than a single data value.

Like in this example ...IF($D6:$AY6>0... it check for whole ARRAY where it's greater then 0.

To enter a formula as an array formula, type the formula in the cell and press the CTRL SHIFT and ENTER keys at the same time rather then just ENTER. You must do this the first time you enter the formula and whenever you edit the formula later. If you do this properly, Excel will display the formula enclosed in curly braces { }. You do not type in the braces -- Excel will display them automatically. If you neglect to enter the formula with CTRL SHIFT ENTER, the formula may return a #VALUE error or return an incorrect result.