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Merck Seasonality

Historical month-by-month and year-by-year returns

Based on 42 calendar years of monthly closes, starting 1985.

By Month

MonthAverageMedian% PositiveBestWorst
January+1.2%+1.8%59%+17.0%20.7%
February+0.1%1.0%45%+13.0%21.7%
March0.2%+0.5%62%+15.7%14.3%
April+1.1%+0.4%57%+16.5%12.2%
May+2.1%+1.9%67%+13.8%9.8%
June+1.6%+1.7%55%+14.3%12.4%
July+0.3%0.3%48%+13.6%13.7%
August+0.6%0.0%49%+15.2%11.6%
September0.9%0.2%49%+12.3%26.6%
October+2.3%+2.4%56%+22.8%14.0%
November+3.2%+3.6%68%+21.9%14.9%
December+1.4%+0.9%61%+14.7%14.6%

By Calendar Year

YearReturn
2025+5.8%
20248.8%
20231.7%
2022+44.8%
20211.8%
202010.1%
2019+19.0%
2018+35.8%
20174.4%
2016+11.5%
20157.0%
2014+13.5%
2013+22.3%
2012+8.6%
2011+4.6%
20101.4%
2009+20.2%
200847.7%
2007+33.3%
2006+37.1%
20051.0%
200430.4%
200318.4%
20023.7%
200137.2%
2000+39.3%
19998.9%
1998+39.2%
1997+33.1%
1996+21.3%
1995+72.1%
1994+10.9%
199320.7%
199221.8%
1991+85.3%
1990+16.0%
1989+34.2%
1988+9.3%
1987+28.0%
1986+80.8%
1985+42.7%

These are historical patterns, not a forecast — past calendar-month performance does not predict future returns.