The Dashboard's Results panel puts two periods of the same length side by side: the days since you last turned the bar on, and as many days before it. Once the bar has been on for 30 days, it compares the last 30 days with the 30 before you turned it on. For each period it shows the number of orders, the average order, and how many orders reached your free shipping threshold.

The figures are your own orders, read from the table WooCommerce keeps for its Analytics, so the plugin tracks nothing about your shoppers. They are order values before tax and shipping, leaving out pending, failed, cancelled and refunded orders, and they are refreshed at most once an hour. A period with too few orders to average says Needs 20 orders rather than a figure that would mostly be chance. If you turned the bar on before version 1.5.36, which is when the date started being recorded, or less than a day ago, the panel compares the last 30 days with the 30 before them.

Two periods differ in more than the bar — the season, a sale, a change of prices — so read the panel as what happened, not as proof of why. With WooCommerce Analytics turned off the table is not kept up to date, and the panel says so instead of showing figures.