A few times over the years I have shared this study.  It breaks down the bullish “1st trading day of the month” tendency by month.  I thought it would be interesting to take another look at it today.  Below is an updated version of the study orginally shown here on July 1, 2009.

July has continued to be the most reliable month in term of closing positive, but when looking at the size of the average gain, it comes in 3rd.  You also note that August remains the worst on both counts (though it is now net positive, whereas in 2009 it was net negative).

Want research like this delivered directly to your inbox on a timely basis? Sign up for the Quantifiable Edges Email List.