It seems to me that SO questions go in some sort of a cycle, with waves of newbie questions occurring for a week or two, then somewhat less naive questions for a few weeks. Don't know if it would be related to school schedules or what, and don't have a clue as to how to analyze it, but it's a potentially interesting phenomenon (if my impressions are true).
What is meta?
- Any Stack Exchange user can ask a question
- The community provides support, votes on ideas, and reports bugs
- Your voice helps shape the way Stack Exchange operates
You can look at score and close count percentage to see if there's a change month over month. I'll leave it to you to see if you can find a pattern month over month.
A naive non-Bayesian approach (no NoSQL)
Your application for running this analysis will be the StackExchange Data Explorer.
Identify cyclical event
Consider the global distribution of SO user base and prevalence of user location in deciding which events are plausible candidates for analysis.
Also, consider the library of existing StackExchange Data Explorer queries. Browse through them, and maybe build off them for your initial data stratification.
Cross-post at Meta CrossValidated SE for further advice on statistical methodology.