A decline in organic traffic may be normal after a holiday, weather event or purchasing cycle. Assessing seasonality requires comparisons across several years and separation from ranking, click-through rate and overall demand changes.
Use suitable historical data
Compare at least two complete cycles where available, adjusting for weekdays and movable holidays. The previous month is rarely a sufficient baseline.
Separate demand from share
Market impressions may fall while your visibility share improves. Do not attribute every lost session to a ranking decline.
Segment categories
Brand searches, products, guides and regions have different cycles. A site-wide average may hide opposing movements.
Connect external events
Weather, school calendars, tax deadlines and media events can shift demand. Record events rather than reconstructing them from memory later.
Forecast a seasonal range
Define an expected range and alert only when the actual value departs meaningfully from it. Revise the model when the market changes permanently.
This framework is an original DigitalNow editorial methodology.