Due to a variety of factors, such as mutual fund money flows and holiday effects, certain days have a high probability of being higher of lower on the day.

With this page, you are able to see each day's particular bias (if there is one), along with the average return and percentage of time that day was up.  The statistics are for the S&P 500 from January of 1950 through August of 2002. 

Click on the desired month below, then on the day you wish to see.  Your browser must support frames (if it doesn't, click here to upgrade your browser for free). 

To see seasonal bias by day of year (instead of by date), click here.  To see seasonality by day of month, click here.

January   |   February   |   March   |   April   |   May   |   June   |   July   |   August   |   September   |   October   |   November   |   December