This web site always goes quite around this time of year.
The main reason is that the students have gone home.
The following graphic shows the visitor profile for last month (orange) and this month (blue) for one particular page on this site (on Rich Pictures):
Month on month that’s a 60% drop off in visitors.
As someone who never really excelled in academia it’s quite gratifying to be providing insight to today’s students.
The graph is courtesy of Google Analytics which amazes me every time I use it. If the graph looks a little different to ones you are used to seeing it’s because it has been rendered by the new version which takes another step forward in providing useful information to the likes of myself.