You can notice the seasonality of your Google AdWords account in your Adspert dashboard following this navigation:
Reports > Insight
Adspert is able to show the seasonality of Impressions, Clicks, Conversions, Conversionrate and Costs. The visualization is done via a heatmap which shows the KPIs in 6 hour block per weekday. Additionally the hourly and daily average is shown in the heatmap. By clicking a eld of the heatmap you can switch the below graph between KPIs per day of the week and KPIs per hour of the day.
Insights for seasonalities in the Adspert dashboard