Since 1986, Apple is down an average 3.4 percent in September versus the Nasdaq Composite, which is down an average of 0.2 percent and the S&P 500 which is down 0.8 percent on average.
September is 1 of just 2 months that Apple has averaged a decline in the last 26 years.
Here are the monthly stats Robert provided to me:
Avg. Performance for Apple:
There’s plenty of reason besides this to think September could be volatile for Apple: there is all sorts of talk that the iPhone 5 might be delayed by parts shortages. (Read more: iPad Mini 'Would Kill Most' 7-Inch Rivals)
—By CNBC’s Bob Pisani
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