I am curious to know about the monthly form submission and view limits at the different account levels.

Do the monthly view and submission limits correspond to the calendar month or to a rolling month to date?

The limit is monthly, and the "unused" views do not rollover for the next month, simply the counter resets on the first day of each month. 

You will see the limits each plan level has, in our pricing page: https://www.jotform.com/pricing 

Let us know if you have more questions, we will be glad to assist you.