I am guessing the created vs resolved dashboard gadget does just that.
Configure the gadget to not accumulate data, select monthly and how many days prior ro current date you want to see data. Use a filter that picks out the issues you want to see the data on. This filter can include several projects if you like.
To get the gadget go to your dashboard, add gadget, type "Cre" in the search box and there it is.
You must be a registered user to add a comment. If you've already registered, sign in. Otherwise, register and sign in.