The Monthly Donations Summary by Fiscal Period Report lists all Gifts, Pledges, and Total Donations for each Fiscal month in a Fiscal year.
Run this report from: Fundraising > Generate Reports > Reports, Fundraising > Executive Window
Note:
In this report, Donations include Fundraising, Events, and Dues donations.
Donations include Gifts and Pledges, including unpaid pledges.
Neither Gifts nor Pledges amounts are adjusted by Debit or Credit memos.

Monthly Donations Summary by Fiscal Period Report