Are investors in for a happy Christmas?

History suggests that the market rally is set to continuewith December and January market performance traditionally strong. But we mustn't take these seasonal patterns too seriously.

History suggests that the rally is set to continue, according to Goldman Sachs. Its study of European markets (going back to 1974) shows that the average market performance in both December and January has been positive 70% of the time. The first and fourth quarters are typically strongest, supporting the 'sell in May' rule.

What's more, strong January to November performances point to a strong December. When the market has gained more than 20% in the first 11 months as in 2009 the average December return has been 3.6%. But don't take these seasonal patterns too seriously. Another one widely highlighted is the January effect, evident in the S&P 500 between 1940 and 2003 the first month sets the tone for the rest of the year, says Tom Stevenson in The Sunday Telegraph. That fell "flat on its face" this year the S&P tanked in January but has since rocketed.

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