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Which month has historically produced the strongest stock market returns? Using daily U.S. stock market data from 1886 through 2025, I compounded each calendar month’s returns separately across 140 complete years. August: +570% November: +544% January: +512% December: +492% September: −58% This measures historical calendar-month seasonality. It does not mean these patterns will continue or that investors should trade based on the month. Sources: G. William Schwert historical stock returns and Kenneth R. French Data Library. #StockMarket #Investing #MarketSeasonality #Shorts