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by 1053r 3118 days ago
That's the highest AVERAGE ROLLING 30 DAY volatility.

For example, on Dec 7, 2013, volatility between the high and the low was 54.6%. [1] However, it was lower for the other days of all 30 day periods that include that day, and averaged out to under 15%.

1 - https://www.coindesk.com/price/