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BlackRock Seasonality

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

Based on 28 calendar years of monthly closes, starting 1999.

By Month

MonthAverageMedian% PositiveBestWorst
January+1.8%+3.1%63%+22.4%18.9%
February0.1%0.7%48%+25.0%12.3%
March+1.2%1.0%44%+34.3%9.5%
April+1.4%+0.3%56%+28.4%18.3%
May+0.9%+2.3%67%+11.5%14.4%
June0.4%+1.2%52%+20.5%21.3%
July+4.5%+5.4%70%+22.4%7.2%
August+0.7%+0.5%54%+21.5%10.1%
September+0.6%+0.8%54%+19.9%22.0%
October+3.1%+3.7%69%+33.2%32.5%
November+4.5%+4.0%70%+22.7%10.3%
December+2.4%+2.5%74%+16.9%8.2%

By Calendar Year

YearReturn
2025+4.4%
2024+26.3%
2023+14.6%
202222.6%
2021+26.9%
2020+43.5%
2019+28.0%
201823.5%
2017+35.0%
2016+11.8%
20154.8%
2014+13.0%
2013+53.1%
2012+16.0%
20116.5%
201017.9%
2009+73.1%
200838.1%
2007+42.7%
2006+40.0%
2005+40.4%
2004+45.5%
2003+34.8%
20025.5%
20010.7%
2000+144.4%

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