The S & P 500 has historically seen a surge in the stock market between April 30 and Oct. 31, typically showing a gain of only 2% between April and October, according to data compiled by CFRA's Sam Stovall. However, recent years, investors who sold in May missed out on sharp advances due to the lack of sharp gains. Over the past decade, the S &P 500 has returned an average return of 1.5% in May and 1.9% in June, with returns even higher in July and August respectively. The potential resolution of the U.S.-Iran war could also boost equities. The S&P 500 is set to rise again following strong quarterly reports from Alphabet and Amazon.