@Ken7, I don't know if it breaks down the months exactly like you want (meaning splitting reservations that span multiple months), but you can look at your transaction report by month.
Go to your Host Dashboard and choose the "Stats" page.
On the "Stats" page select the "Earnings" tab.
In the "Earnings" tab, scroll down and click on the "Transaction History" link.
(You can also use the pop-up menu under your little circle picture to directly to "Transaction History")
In the "Transaction History" page, you can create reports of your earnings grouped by dates of your choosing. The data can be exported.