You can display two calendar views at the same time.
When you select the Month calendar view (from the drop-down menu in the upper-left corner of the screen), Dual calender view is automatically displayed. Tap one of the three calendar tabs (between the two calendar views) to change the bottom calendar view.
From Day, Week, and Agenda calendar view, drag the calendar handle (at the top of the screen) downward to display the Month calendar view above your existing calendar view. Drag it back up to close it.