You can see how much you spend on a category for each month individually, but it would be helpful to see an average as well. Right now, you need to go to "Spending By Envelope", select the category and time period, and divide the total amount of spending by the number of months you've selected.
It's helpful to see how my spending has changed since I implemented something (ex. Ever since I started shopping at Aldi vs Cub, I've spend x amount less on groceries). It's helpful for planning purposes (Ex. If I want to start going to yoga classes, I'll need to cut down on going out to eat by x amount).