What this shows: for each calendar day, the Bitcoin price divided by the Jan-1 price of the same year (a ratio: 1.0 = flat vs the Jan-1 level, 0.692 = down 30.8% year-to-date). Every year from 2011 becomes one curve aligned by day-of-year, so you can compare how far BTC is into its yearly range on any given date across different years. The current year is drawn in red; historical years in gray.

Presidential cycle: years are grouped by their position in the US presidential cycle (elections held in November of 2008, 2012, 2016, 2020, 2024, ...): year 1 (post-election: 2013, 2017, 2021, 2025), midterm (2014, 2018, 2022, 2026), year 3 (pre-election: 2011, 2015, 2019, 2023), election year (2012, 2016, 2020, 2024). The page loads with the current year selected; the dropdown above the chart changes which year is compared (2011 to the present). The highlighted year is always compared against its own cycle group: the orange line is the average of the other years in that group, the light-gray pair is the min/max envelope, and the shaded band is the group average ± 1 standard deviation (dispersion of the group years' daily values across the year; each group has its own SD). When 2027 begins the page will automatically default to 2027 (a year-3 year) and compare it against the year-3 set; and so on.

Data: daily BTC/USD market price from blockchain.info (free, no key). 2010 is excluded (no reliable daily prices). Leap days (Feb 29) are folded into Feb 28 so every year shares the same 365-day axis. The dashed line marks 1.0 (the Jan-1 baseline). Drag to pan, shift+drag to box-zoom, drag the Y-axis to zoom it, double-click to reset. Data may be revised.

Data: chart data (JSON) · source series (CSV) · blockchain.info market price