As David noted, time to dust off the charts, we have AAP numbers.
Note: Its late, kids didn't want to sleep and I have an early meeting. So I'm just going to note that ebook sales were good, trade sales show a downward trend that is in line with prior months. I'm also skipping some graphs (Mea Culpa). But the main data is here for your enjoyment:
The only seasonal is ebooks in bar format: