I have been using the same monthly calendar for the last seven years...since I first went back to a paper planner. It's just a table in a Word document that I switch out each year with new fonts, colors and lots and lots of dates.
I fill up each page as things get scheduled and then use it to fill in my weekly sheets at the start of each month.
I've tried two page monthly calendars and horizontal calendars, but this vertical one with a little extra space at the bottom that I often fill with extra notes, has worked the best.
Here's the PDF... Download 2017 Planner Calendar