This free printable calendar for December 2013 includes major holidays in blue and shows the entire month on one page. It can be downloaded in PDF or customizable DOC format. Free to download and print.
This free calendar is available in two versions: PDF and DOC (for Microsoft Word).
The PDF version: just download it, open it in a program that can display PDF files, and print.
The DOC version can be edited — adding your own events, for example. It is compatible with Microsoft Word, Google Docs, and any other word processing app that's compatible with the Microsoft Word .DOC format.