BTC Monthly Returns
LockedYear × month heat-table — % return for each calendar month over BTC's full history.
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What this chart shows
Methodology
For each month (Jan..Dec) of each year (2011→today), return = month_close / month_open − 1. The trailing 'YTD' column is the year-aggregate (Dec_close / Jan_open − 1). The bottom row is the column mean across all years — your at-a-glance read of BTC seasonality. Colour scale saturates at ±60 %.