Low volume is typical during the holidays. I'm really not much of a fan of data analysis of that kind, you can find TONS of it looking at everything aside from price: P/C ratio, seasonality, GPD, etc, etc. For me, it clogs up the thought process. What really matters to me is price. Patterns. Trendlines. In fact, I don't even watch CNBC anymore. I trade and chart in complete silence. I don't follow news, nor people who tweet news. This keeps my focus where it needs to be. I used to follow Urban Carmel who charts every kind of data out there - but it doesn't mean anything to me. Many people find this kind of stuff useful, but I don't. And for every conclusion on data points (such as volume) there is someone else with a contrary conclusion. Because, this is not a science. To each his own. I have found that I'd rather be wrong employing my ideas than wrong employing someone else's ideas.
I do day trades once in a while, but tend to swing. Sometimes I'll hold for several weeks. Just depends on the pattern and tape. Lately, I've been most successful holding just a few days. That speaks more to the market than anything else, I think.