MarketSci Blog constructs a stock market model that uses historical seasonality of the stock market to determine the chance of a positive or negative day in the market, each day. For example ...

There are a lot of well-known sayings related to stock market seasonality ... That’s the first seasonal window highlighted here in green on our TradeSmith Seasonality chart: But why is January ...

Those are all examples of “seasonality” in the stock market: recurring periods of growth or weakness that happen with such astonishing frequency that they’ve become expected, annual events.