Here is a collection of the months of the year to use for Calendar Math. I like to use them in addition the the calendar instead of using a poster. I can rearrange them and make them fit in tight spaces. They can also be used interactively with the students. I used magnetic tape on the back and students were able to manipulate them. I create these pink and chevron with black background to coincide with my classroom theme last year. I just wanted to share with you all. Hopefully you will enjoy them as much as I did.
For lasting durability I suggest printing on card stock (but regular paper works too) and laminating.