September isn't known to be one of the best months for stock performance. Over the past century, the S 500 index has, on average, slipped during this month, a phenomenon known as the "September Effect." The past four years continued this trend, with losses between 4% and 9% for the index. So far this year, we're following that path, with the S 500 heading for a September decline of more than 3% -- and we're still in the early part of the month.

This September's drop has been broad-based as companies such as retailer Dollar General, tech giant Super Micro Computer, and biotech company were among the 10 worst performers -- with double-digit losses -- in the S 500 so far. All three of these companies climbed in the earlier months of the year, and Supermicro even soared 188% in the first half. Now, as this September's performance unfolds you may be wondering if you should buy stocks this month or stay away. Here's what history says.

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Source Fool.com