Below is an interesting chart showing the seasonality of the S&P 500 from 1985 till 2019. The total return of the S&P 500 is 10% per year on average. As can be seen on the chart on average the S&P 500 goes up till July when it stalls to start rising again in October. This effect is well known, there’s even a famous saying about it: “Sell in May and go away. But remember to come back in September”.