I would no bet on that! Traffic for all sites drop during certain times especially over the Christmas and New Year holidays. For example, my site traffic drops over the week end and for most major holidays. Because this time of year is shared by people of three major faiths throughout the world, I would say you are just like the rest of us.
But I would try and freshen up your site. Consistency in adding content is more important than how often you add content short of barely adding content at all. For some reason, search engines like consistency. So even a smaller blog that only posts once or twice each week can perform rather well.