August is a tough month for the stock market.
According to LPL Research, the average monthly decline in August over the past 20 years for the S&P 500 is 1%.
Stock started August to the upside, closing in on the January 2018 highs, but gave back some of those gains on Friday, as investors grappled with Turkey's economic woes, which rattled global markets.
Stephen Guilfoyle, a Real Money contributor, and panelist on TheStreet's Trading Strategies roundtable, said August and September are usually the worst performing months of the year for the stock market.
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