October Bitcoin Returns 17.8%, But Regime Matters More

October delivers a mean return of 17.8% with an 80% win rate, making it the cleanest seasonal month for Bitcoin since 2016. The median return of 12.7% confirms this isn't skew-driven luck — it's the only month where mean, median, and win rate align without distortion.

But the calendar alone is a trap. Analysts reviewing the 2016-2025 sample period found that a month with a positive average isn't necessarily a month with a repeatable edge. If the median is negative and the win rate is weak, what you have is optionality disguised as consistency.

August is the perfect example. Its mean return sits at 1.9%, but the median is negative 7.3% and the win rate drops to 30%. That's variance-dominant, not seasonality. July performs better as the next-best stable window, with a 9.1% mean return, 12.4% median, and 70% win rate.

Several months flip sign depending on regime — January, March, May, June, August, November, and December all look constructive in the full sample but turn negative once you isolate a weaker macro backdrop. December's win rate is just 40%. May is high dispersion with large upside and downside tails, making it a trap for traders chasing seasonal patterns.

Bitcoin's Q1 trajectory is a stronger predictor of year-end outcome than any seasonal month. After February finished positive, Bitcoin ended the year positive 7 out of 7 times. After March finished positive, it ended the year positive 5 out of 5 times.

Month-to-month sign momentum shows 57.1% positive continuation after an up month and 55.3% after a down month. The market enters each month from a specific state, which changes the forward distribution — and that's the useful part of seasonality most traders ignore.