Quote from slumdog:
Here is the intra day range of the Dow (regular trading hours), excludes overnight gaps, from 2002 to yesterday.
Each year is about 260 data points.
There is a period from mid 2003 to mid 2007 where intraday moves were lower than what we have seen this year.
We have all been spoilt by the wild action from 2008 onwards.
A couple of 1000 moves can be seen (one is the flash crash).
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You have to include ETH volatility, the dow was gapping 200-400 points on a regular basis during the financial crisis and the euro debt crisis. I think weekly range is a more accurate indicator of volatility, just look at the huge range weekly bars on the SPX during those tumultuous years.