A favorable calendar meets a demanding market
Wall Street’s strongest season arrives next week with an unusually compelling record behind it.
The November–April trading window begins Monday, November 2, measured from Friday’s October 30 close. Across the 19 completed midterm cycles since 1950, the S&P 500 has finished that six-month period higher every time, with an average gain of approximately 15%.
A higher close on April 30, 2027, would extend the sequence to 20.
The broader seasonal pattern is familiar. November through April has historically delivered substantially stronger returns than May through October, giving rise to the “Halloween indicator” and the saying “sell in May and go away.”
Our reading is that the calendar provides a constructive backdrop as election uncertainty begins to clear. Whether that backdrop becomes a sustained rally will depend on earnings, inflation and the cost of financing the next stage of business growth.
The summer market has become harder to ignore
The traditional comparison looks striking over long periods.
Since 1950, the Dow Jones Industrial Average has averaged approximately 7% from November through April, compared with less than 1% from May through October.
But the S&P 500’s more recent history complicates a rigid seasonal strategy:
| Period examined | Average November–April gain | Average May–October gain |
|---|---|---|
| 1950–1987 | Approximately 7% | Approximately 1% |
| Latest 10-year sample | Approximately 7% | Approximately 7% |
The figures come from the historical comparison accompanying this week’s seasonal analysis. May through October outperformed the other half in five of those latest 10 years.
That changes the practical calculation. Leaving equities for six months can mean missing substantial gains, even when the longer-term average favors winter.
The historical advantage may help explain when returns have tended to concentrate. Turning it into an automatic exit and reentry schedule requires a separate judgment.
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The midterm pattern offers a plausible explanation
The timing of elections may help explain why some autumn-to-spring periods have been particularly strong.
Before voting, businesses and investors must assess competing possibilities for taxes, regulation and government spending. Results narrow that range, allowing companies to plan with a clearer understanding of the policy environment.
Historical post-midterm strength has been associated with improving policy clarity across different political outcomes. That offers a plausible explanation for the pattern, although it does not establish that elections caused the subsequent gains.
The broader seasonal effect also has academic support. A study published in 2020 using stock-market histories worldwide found average November–April returns approximately four percentage points higher than May–October returns.
Evidence for a reliably superior trading strategy is less settled. A separate 2014 study did not establish significant outperformance from trading the Halloween effect.
For investors, that distinction matters: an observable historical pattern can exist without providing a dependable method for beating the market.
A higher April close can still include a difficult winter
The 19-for-19 record measures the destination, comparing the end of October with the end of April. It does not describe every decline along the route.
A portfolio could suffer a substantial interim loss and still contribute another positive observation to the streak. Nineteen election cycles also represent a limited sample spanning very different economic conditions.
This year’s starting point includes 3.7% annual consumer-price inflation in September, alongside questions about interest rates and the returns on heavy AI investment. Those issues continue after the ballots are counted.
A stronger foundation for a rally would combine resilient earnings with easing financing pressure. Persistent inflation and higher yields could make that combination harder to achieve.
The seasonal record gives investors a reason to watch for improving conditions after the election. The more persuasive signal would be companies delivering profits that justify renewed confidence—and a rally broad enough to extend beyond a handful of large stocks.
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