I'm pretty sur that you are out of luck. Normal reports in Google Analytics have a selector that lets you show that report by hour, day week, or month. For custom dashboards, this option is not available:
For normal reports, th query string can be "hacked" to give you a month view. The biggest problem is that is hard to bookmark that query string. That is because the dates in the bookmarkable query string are static, and don't change for the next month.
To use it, you need to find your Google Analytics Report ID by logging into your Analytics account and looking at the URL. It will have an id similar to this format:
a1234567w12345678p1234567. Copy and paste that into the form and you will get a set of links that look like this:
To get to your custom dashboard rather than the default Google Analytics visitor overview, you will also need to find the page id for your dashboard (from a Google Analytics URL) and put it in. I tested it with a dashboard id of
Unfortunately, even when you do this to add the query strings to the URL requesting the view by a different time period, Google Analytics doesn't honor it. It appears that they just don't support this feature for custom dashboards.