Always consider hidden risks
 SP500 Seasonalities
SP500 Index Seasonalities: December Roller Coaster ?
​December 1 ( From TradingView, Stockcharts, Investopedia  )

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SP500 Index Seasonalities: December Roller Coaster ?    $SPY, $SPX,   #Trading #Seasonalities #SP500 #spy
Daily Chart - Seasonalities - Daily Performance in % of SP500 Index - Average of the past 5 years
November 1st pegged at 100

.( See chart below )

Monthly Chart - Seasonalities - Monthly Performance in % of SP500 Index - Average of the past 5 years

.( See chart below )
The Situation

​​December Market Seasonals (SP500)

The Month of December is also very special in terms of Seasonalities
​as the whole ​Market is more trendy than usual: From a peak on
​December 6th, correction tilDecember 15​ and ​resume a strong ​
​uptrend almost til month end.​ The Trade Pattern ​is to finally to have
​a close above the beginning of the ​month ​for the Mighty SP500
​​Index. SO good Technical Pattern it is for the month of ​December after that last down wave around the 15th...
​​This move is generally compounded because seasoned traders know about ​this seasonal movement and also buy positions and get long the market ​to take advantage of this at times for the usual Santa Claus Rally.

Most of the December down move is done by the 15th of the month according to the average of the past 5 years. ( See first chart below ).​​​

As written by Cory Mitchell: ​​Seasonality is a tool to be used in conjunction with other technical signals; it typically isn't used as a trade signal on its own. It does help isolate times that may be more favorable for buying or selling though.

Also read that must read articles on December seasonalities:
Did the Santa Claus rally start this week?

​​Seasonality of S&P 500 and Mega Cap Stocks