Too much information about stock market seasonality can lead to overload and bad decisions for investors. Just enough can be fun, even valuable if properly deployed.

Indeed, traders and speculators who specialize in technical analysis take advantage of inefficiencies created by retail investors going too deep on those kinds of things.

And even among the experts, you'll find an amusing variance in how they define things such as the "Santa Claus Rally."

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At the same time, as some of the greatest asset allocators who ever lived will tell you, the stock market is a…