September 2011. That was the last time the S&P 500 had a monthly performance worse than -6.83%, which is what we just experienced in the month of October. Had it not been for the strong rally over the last few days of the month, that number would have been approaching numbers not seen since the financial crisis in 2008. Market corrections are fairly normal, happening 56 times since World War II. But this will be only the second year ever- the other being 1990 -that the S&P 500 will have had two separate 10%+ corrections in the same calendar year.