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The Best Six Months Of The Year Could Get Even Better If History Is Any Guide (Which Is Questionable, But Still…)

So much for “sell in May and go away.” The S&P 500 Index has gained more than 6% during the historically worst six months of the year and could finish higher each of the six months (from May to October) for the first time since 1980. Then again, 2017 has been breaking records left and right, so the strength we’ve seen during this seasonally weak period shouldn’t be too surprising.

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The table below shows that the S&P 500 historically does much better from November to April, with an average gain of 7.0% versus 1.5% for the other six months.

The following table, which shows average S&P 500 performance for all possible six-month combinations, confirms that the next six months have indeed been the strongest, with the ”sell in May” period of May to October being the weakest, on average.

S&P 500 Index

*Please note: The modern design of the S&P 500 stock index was first launched in 1957. Performance back to 1950 incorporates the performance of predecessor index, the S&P 90.

Per Ryan Detrick, Senior Market Strategist, “Wouldn’t you know it, when the worst six months of the year are strong (like 2017), the best six months of the year that follow have tended to do even better.”

The table below outlines all the years in which the worst six-month period (May to October) was up at least 5% and what happened next: The usually strong November to April period is up 9.2% on average, above the 7.0% average return. It doesn’t stop there though, as November is up 3.4% versus the average November return of 1.5% and the return during November and December is 5.0% versus the average year of 3.2%.


Historically, the remainder of the fourth quarter (November to December), and the subsequent six-month period (November to April) saw greater average returns compared with all periods. Though this is only one metric, if the S&P 500 holds up through the end of the month, we could be in for continued above-average performance during an already historically strong period.

Article by LPL Financial

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