User blog comment:Paul.rea/Teen Wolf News 090314/@comment-206.248.227.112-20140908220459/@comment-4091815-20140908222739

Here is the most common grading system in the US - http://en.wikipedia.org/wiki/Academic_grading_in_the_United_States#Numerical_and_letter_grades

March opening weekends bring in about $20 million more than does a picture that opens in September.

March is primetime with big movies like Alice in Wonderland, Oz the Great and Powerful, 300, Watchmen and Ice Age all coming in the month of March. Removing Divergent and Hunger Games from the mix - opening weekends for the top 10 March Movies of all time average $76 million.

There's never been a September opening weekend that topped $43 million.