This is a great, simple infographic that would be a lot of fun for your students to take a look at. It shows how common each date is for birthdays. It is always interesting to find out that a friend, or especially a celebrity, shares your birthday. Now, with this infographic, you can see how common your birthday really is.
Use this infographic for younger students as an exercise in finding information. Ask them questions about probability, for instance the probability of meeting someone born in August versus January.
This is also a great example of an easy infographic to create. Use it to share other information about dates. For instance, use it for major battles in American history. As you study American history, mark each date that a major battle occurs. At the end of the year, discuss why battles were more common in certain parts of the year.