Hi forms, her from Investopedia:Since 1950, the Dow Jones...

• Hi forms, her from Investopedia:
  
• Since 1950, the Dow Jones Industrial Average (DJIA) has averaged a decline of 0.8%, while the S&P 500 has averaged a 0.5% decline during the month of September.
• The September Effect is a market anomaly, unrelated to any particular market event or news.
• The September Effect is a worldwide phenomenon; it doesn't only affect U.S. markets.
• Some analysts consider the negative market effect may be attributable to seasonal behavioral bias as investors make portfolio changes to cash in at summer's end.

Here from stock charts.com, XAO over last five years;


All Ordinaries, up one year in five.