Sell Your Stocks for the Summer?

According to Newsweek, right about now is about the worst time for stock performance.

First off, the article shows that, at least since 1990, stocks perform much worse in the summer. Even worse, the second and third quarters of the second year of a president's term are usually the worst time for stocks (why I can't tell you).

On the other hand, if you believe in buy low and sell high, and have some money to invest, right now might be the very best time to buy stocks. Or not. Who knows? My stock buying record is spotty at best.