It’s very difficult to say which direction the stock market will head in any given month. However, if recent history is any indication, investors should buckle their seat belts in the month of August.

As CNBC’s Carl Quintanilla pointed out on Twitter, the S&P 500 has moved between 2 and 6.3 percent in each of the last seven Augusts.

August 2015 was the market’s biggest move when it fell 6.3 percent on fears that China’s economy was cooling.

Since the beginning of August 2009, the SPDR S&P 500 ETF Trust SPY 0.11% is up 115.6 percent, yet the market has delivered negative returns during the month of August in four of the past seven years.

Despite the market’s tendency for large downswings in August, Quintanilla followed up with an encouraging tweet.

“Since 1980, August is the 2nd worst month for the S&P. But in election years, it’s the BEST month,” he tweeted.

Since 2009, the S&P 500 has averaged a 1.5 percent decline in August. However, as Quintanilla pointed out, it delivered…

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