Monthly Market Returns - The January Effect, Etc.
Do some months have significantly different stock market returns than others?
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.
From the results, it looks like some months really are significantly better than average.
November through January is a particularly strong stretch;
and September is the "danger" month, with an overall negative return.
Surprisingly, October shows positive returns on average, although October 1987 and 2008 were pretty hard to forget.
Note that December has been better than January, which contradicts two popular myths: the December Selloff, and the January Effect.
But also notice that there are lots of exceptions to the pattern.
There have been bad Januaries, and great Septembers.
And of course the biggest trend of all is that the market goes up over time.
So maybe the lesson here is the usual one, that long-term buy and hold is the winning strategy.