June | 2018 | iMarketSignals

From 1950 to 2018 the S&P 500 performed best from November to April, and significantly worse from May to October during most years.
From 1950-2018 the real annualized return for the S&P 500 was 6.71%. Had one only invested from November to April each year the return would have been 6.60%, almost the same.
Investing in a money-market fund from May to October each year and the remaining time in the S&P 500 would have provided a higher real annualized return of 7.17%.
For the 32 year period of rising interest rates (1950-1982) the real return of the S&P 500 was only 5.40%, much less than for following 36 years of falling interest rates.