Keep in mind that this is an 'average' and that exogenous events can greatly affect the normalized results.
Chart courtesy of friend Brian at ContraryInvestor. 
Gold Seasonality with Gold 2010 Daily Price Chart Overlay
“Blood and power intoxicate; they help to develop callousness and debauchery. The mind then becomes capable of the most abnormal cruelty, which it regards pleasure; the man and the citizen are swallowed up in the tyrant; and the return to human dignity, repentance, moral resurrection, becomes almost impossible."
Fyodor Dostoevsky, The House of the Dead
Keep in mind that this is an 'average' and that exogenous events can greatly affect the normalized results.
Chart courtesy of friend Brian at ContraryInvestor. 
Gold Seasonality with Gold 2010 Daily Price Chart Overlay