I have an instance of the full calendar running on my asp.net site, but it shows too many weeks. For example, this does not show 6 weeks, even if only 5 weeks in November.
You just need to set fixedWeekCount: false , which should do the trick, it will show the correct number of weeks per month.
fixedWeekCount: false
http://fullcalendar.io/docs/display/fixedWeekCount/