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Market Extra: October’s performance could decide if stocks have a great, or middling, run deep into 2018

The market’s hardest period of the year, in terms of historical seasonal patterns, is just about over, though investors can be forgiven if they didn’t realize things were supposed to be risky.

The period between the end of April and the end of October is informally considered the “worst six months” for both the Dow Jones Industrial Average DJIA, +0.11% and the S&P 500 SPX, +0.37% according to the Stock Trader’s Almanac, with the tail end of that stretch seen as particularly risky. (For the Nasdaq COMP, +0.66% the period between the end of June and the end of October is considered the worst four months of the year)

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