Here's a statement of the obvious: The opinions expressed here are those of the participants, not those of the Mutual Fund Observer. We cannot vouch for the accuracy or appropriateness of any of it, though we do encourage civility and good humor.
FYI: This calculator uses sixty-odd years of S&P 500 data to let you see for yourself. Select a month; the calculator will show you its good and bad years and overall return, for the years from 1950 until recently.