one userform for multiple sheets

I have workbook with 12 sheets in it. each sheet is identical except that they are for each month of the year. i am using a userform to enter the data into each sheet. Each sheet will have different data. I want to be able to use the same user form on each sheet but still have them insert into the open sheet. Currently I am creating duplicates of the userform for each sheet but it gets VERY!!! tiresome and it is making the workbook VERY large (5 mb so far). For example. the first sheet is "april". i open the userform and enter the data into the userform. the userform enters the data into the sheet. now i go to sheet "may". currently I open a userform in that sheet that looks exactly the same as the userform in sheet "april" but is a completely different userform. I want to be able to use the userform from sheet "april" in sheet "may" but when in sheet "may" it inserts into sheet "may".
Thank you so much in advance