January Barometer
A theory stating that the direction of the S&P 500 during the month of January sets the S&P 500's direction for the remainder of the year.
Investopedia Commentary
In other words, if the S&P 500 is up in January, it will be up throughout the year.
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See also: Barometer, Index, January Effect, October Effect, Santa Claus Rally, Standard and Poor's 500 Index - S&P 500, Weekend Effect