The Summertime Blues- a look at how markets perform from May through August

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The S&P 500 and the Dow Jones Industrial Average have each finished in negative territory in 15 of the past 39 summers (or about 38.5% of the time).

Although summer doesn’t officially begin for three more weeks, many Americans recognize Memorial Day as the unofficial start of the season. While this summer is likely to be far from normal, we typically associate the season with warm weather, beach vacations, and longer days; however, in the investment world, the summer months are associated with lackluster returns, also known as the "Summertime Blues." This year, we enter the summer months coming off one of the most volatile starts to a year ever. However, the major indices have rebounded strongly off their March bottoms with the S&P 500 (SPX) and Dow Jones Industrial Average (DJIA) now down -6.03% and -10.48% for the year, respectively (through 5/27).

The table below shows the returns of both the Dow Jones Industrial Average and the S&P 500 during the summer months (May 31st to August 31st) back to 1981. The S&P 500 and the Dow Jones Industrial Average have each finished in negative territory in 15 of the past 39 summers (or about 38.5% of the time). Of those 15 down summers, there were 13 summers in which SPX and DJIA were both down at the same time. While less than half of the summers have been negative for these benchmarks, the bad summers were indeed bad, with some down double digits over the three-month period. For instance, in the summer of 1990, the SPX fell -10.69%. In 1998, it saw a drop of -12.24%; but the worst summer came in 2002 during the tech crash when the Index declined -14.16%. During the summer of 2008, which began a famously longer slide, SPX fell -8.39%. The market has bucked the trend recently, however, as both indices have posted gains during the most recent four summers.

In an effort to determine if there is one month that tends to have an outsized effect on summer returns as a whole, our team of analysts compiled a monthly summary of S&P 500 returns going back to 1958. What we found is that the summer months tend to have a lower median return than most of the other months of the year. It is actually the month of September that has historically provided the lowest median return at -0.30%, but it is followed closely by June which has a median return of just 0.05%. Notice too that the spread, i.e., the max return in a given month versus the minimum return in a given month, is relatively low for the summer months (namely June and July). A closer look at the month of June reveals a max return of 6.89% in the last 60 years, which it posted last year, and also followed a May return of -6.58%. Every other month, except February, had a maximum return in excess of 8%. Clearly, June has historically been one of the weaker months for SPX returns. However, we can't blame the Summertime Blues on June alone. August has experienced the second-largest drawdown (after October) at -14.56%, which compares unfavorably to the other months' minimums which seem to hover around -10%. The data below indicates that the Summertime Blues cannot be traced back to just one month.

To take this concept one step further, we looked at four hypothetical portfolios specific to each of the four seasons. Defined as follows:

Winter Portfolio Dates: 11/30 - 2/28

Spring Portfolio Dates: 2/28 - 5/31

Summer Portfolio Dates: 5/31 - 8/31

Fall Portfolio Dates: 8/31 – 11/30

The end result? The summer portfolio greatly underperformed the other three seasons - fall, winter, and spring. Hypothetically, if you were to invest only during the spring months (March through May), the initial investment would have had a cumulative return of 375% from 1958 through 2019, with an average annualized return of 10.58%, making it the best performing seasonal portfolio. The summer months pale in comparison to the others, gaining a measly 46% since 1958! That results in an average annualized rate of return of only 2.47%.

Dorsey, Wright & Associates, LLC, a Nasdaq Company, is a registered investment advisory firm. Registration does not imply any level of skill or training.

The returns for the “Seasonal Growth” chart above are the result of a hypothetical back test. Back tests are hypothetical and are provided for informational purposes to illustrate the effects of the strategy during a specific period. The hypothetical performance of the non-investable indexes are the result of testing by Nasdaq Dorsey Wright, but have not been verified by any third party and are unaudited. Back-testing is achieved through retroactive application of an investment methodology designed with the benefit of hindsight. Model data (both back-tested and live) does not represent the impact of material economic and market factors might have on an investment advisor’s decision making process if the advisor were actually managing client money. Unless otherwise stated, the performance information included in this article does not include dividends or all potential transaction costs. Investors cannot invest directly in an index. Indexes have no fees. Past performance is not indicative of future results. Potential for profits is accompanied by possibility of loss.

Nothing contained within the article should be construed as an offer to sell or the solicitation of an offer to buy any security. This article does not attempt to examine all the facts and circumstances which may be relevant to any company, industry or security mentioned herein. We are not soliciting any action based on this article. It is for the general information of and does not constitute a personal recommendation or take into account the particular investment objectives, financial situations, or needs of individual clients. Before acting on any analysis, advice or recommendation (express or implied), investors should consider whether the security or strategy in question is suitable for their particular circumstances and, if necessary, seek professional advice.

Dorsey Wright’s relative strength strategy is not a guarantee. There may be times when all assets are unfavorable and depreciate in value. Relative Strength is a measure of price momentum based on historical price activity. Relative Strength is not predictive and there is no assurance that forecasts based on relative strength can be relied upon to be successful or outperform any index, asset, or strategy.

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