Please Note: Blog posts are not selected, edited or screened by Seeking Alpha editors.

Why May-through-October have been such perilous months for investors.

From 1950 to 2007, the market from May to October provided an average annual gain of 0.6%, enough to earn $1,021 on $10,000 in those years. But if you had invested only in the "best six months," from November to April, your average gain would have been 7.6%, netting you $531,444 over those 58 years.