So what of the 255-point rally in the Dow Industrials on the first day of the historically worst month for stocks -- September?
In the September 1 Short Term Update, EWI's Chief Market Analyst Steve Hochberg offers this explanation:
"...a positive seasonal bias exists throughout this week...Seasonals are tendencies only, so while it may be helpful to use these biases as one of many indicators, one cannot fashion a forecast based solely on them."
In 2008, the market sported a similarly positive seasonal bias:
You can see what happened in 2008 after the positive seasonal tendency "wore off."
Of course, what happened then may not unfold in the same way in 2010. The point, however, is to remember that September can be sinister.
Plus, Steve explained that there is a very specific time when a market analyst may gain the "greatest analytical insights" about a big rally or big decline.