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
"Our government is the potent, the omnipresent teacher. For good or for ill, it teaches the whole people by its example. Crime is contagious. If the government becomes a lawbreaker, it breeds contempt for law; it invites every man to become a law unto himself; it invites anarchy."
Louis Brandeis, Olmstead v. United States, 1928
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