The 'Month' dimension reports the month that a given metric occurred. The first dimension item is the first month in the date range, and the last dimension item is the last month in the date range. This dimension is vital for trended reports, as it allows you to see metrics over time.
Populate this dimension with data
This dimension works out of the box for all implementations. If a report suite contains data, this dimension works.
Dimension items include the month and year of a given date.