You can create a table (tblMonth) with two fields MonthID (Number, NOT Autonumber - PRIMARY KEY), Month (Text)
1, Jan
2, Feb
...
12, Dec
Then create a combobox (cboMonth) that shows values from the table (Hiding the primary key column).
Then in your criteria (see above link to your other thread), have it reference the combobox. It will then use the primary key as criteria. So if you've entered the Month and MonthID correctly, the user will see the name of the month. The combobox will work in replacing the textbox where the user enters the number for the month.