"Past Performance is not indicative of future blah blah bla".... but historically December through February are strong up months for the SP500. If you are serious about not outsmarting the market, and the playbook for the market for the past 100 years is available, why not use it?
For example, September is traditionally a down month, just like it was this year. I cashed out just after the August rally, and bought back in late sept. I'm that permabull that frightens everyone else here, but I absolutely will play the averages.