Over the past 21 years (solid lines in the chart below), April has exhibited a pattern of steady gains starting around April 7 (Tue)(Trading Day 5) and continuing through the end of the month, with only minor fluctuations along the way. Overall, it has generally finished positive across the board.
Midterm election years since 1950 (dashed lines) show strength from April 7 (Tue) through mid-April only, followed by choppy trading that typically ends the month flat or in negative territory.
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