Tracking Seasonal Search Behavior

"Many products are naturally seasonal in nature. For example, Halloween costumes are generally only sold in the weeks preceding the holiday each year. However, while this seasonal behavior is easy to conceptualize, it can frustrate your ability to measure the progress of your SEO efforts, and the traffic growth you would like to see from those efforts. For example, if the overall market for your product is down 20%, and traffic stayed flat through a normal seasonal decline, you have actually made progress. Your SEO efforts have completely offset a pretty significant market trend."

Tracking Seasonal Search Behavior