#Bitcoin ’s monthly performance shows a seasonal pattern, with September historically the weakest month of the year. Across the last decade, the average return for September has been around –4% to –5%, making it the only month that has been negative more often than positive. August fares slightly better but still averages near break-even, with many years showing modest declines of around –2%. When combining August and September, Bitcoin has posted losses in two-thirds of years, with an average drop of about –7.5%. #btc