30-Day Average Daily Volume

The thirty-day average is the steadier of the two volume averages and is normally used when comparing the liquidity of one asset with another. Because it spans roughly a month it absorbs single event days that dominate the seven-day figure. It is still an unweighted mean of daily totals across whichever venues the provider includes.

计算方式

sum of daily trading volume over the trailing 30 days / 30

易产生误导之处

The smoothing cuts both ways: after a venue delists an asset or an incentive program ends, this figure keeps reporting the old level for weeks. A rolling thirty days is not a calendar month, so it will never reconcile with monthly exchange or research reports. Windows that happen to contain a quarterly futures expiry or a large unlock carry that event for a month afterward. For assets whose volume is concentrated on one or two venues, the average measures the health of those venues as much as the asset.

与股权的类比，以及为何该类比不成立

Thirty-day average daily volume in equities; the equity version excludes off-exchange activity that must still be reported, while this figure may include derivative and synthetic venue activity that never touches the asset itself.

如何解读高值或低值

A higher thirty-day average means sustained activity over the month rather than a single busy day. Reading it beside the seven-day average shows whether recent activity is above or below the monthly norm.