Is today the best trading day of the year? According to the website Marketwatch, the first trading day of July - that's today - is the one day of the year most likely to have a positive return for the S&P 500, which it has done 83.3 percent of the time.
The first half of July tends to be mildly bullish, and often hosts a brief summer rally. Keep in mind, though, that the summer rally tends to be the weakest of all seasonal rallies. Before you get too excited, note that the average return for the S&P on this date is 0.35 percent.
The S&P isn't the only likely winner on this date. The win rate for the Dow Jones Industrial Average is 77.77 percent, and the win rate for the Nasdaq is 72.22 percent.