I came across a pretty interesting chart/graphic via The Chart Store. The image is pretty much self explanatory, but essentially shows the average 1 month percent change of the S&P 500 for all years 1928-2009.
Obviously the market has risen significantly since 1929, so it is no surprise that most months are in the green; however, it is pretty interesting to note that most losses come in just 3 months (2 of which bookend the sell in May and go away theory).
Now we can be happy May is over, but are you looking forward to September?
More on this topic
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Economist Gary Shilling: S&P 500 will drop 43% this year?
(Value Investing, 4/11/12)
Sell in May and Go Away? No Way!
(Wall Street Daily, 5/10/12)
Stocks Have You Worried? Here's What You Do
(Money Morning, 5/14/12)