- December 1, 1963 (This strip is adapted in the episode "The Winter Games" from the 2014 French TV series Peanuts)
- December 2, 1963 (This strip and the following two strips are adapted in You're in Love, Charlie Brown)
- December 3, 1963
- December 4, 1963
- December 5, 1963 (The following 2 strips are adapted in A Charlie Brown Christmas.)
- December 6, 1963
- December 7, 1963
- December 8, 1963
- December 9, 1963 (This strip is adapted in It Was a Short Summer, Charlie Brown)
- December 10, 1963
- December 11, 1963
- December 12, 1963
- December 13, 1963
- December 14, 1963
- December 15, 1963
- December 16, 1963 (Beethoven's birthday)
- December 17, 1963 (Beginning of a storyline which was later adapted as the segment "The Play" of the 1985 The Charlie Brown and Snoopy Show episode "Sally's Sweet Babboo")
- December 18, 1963 (This strip is used on the page for December 2 of the Dayspring Peanuts A Year's Worth of Smiles and Blessings Desk Calendar)
- December 19, 1963
- December 20, 1963
- December 21, 1963
- December 22, 1963
- December 23, 1963
- December 24, 1963
- December 25, 1963 (The font of "Christmas" in this strip is adapted in A Charlie Brown Christmas.)
- December 26, 1963
- December 27, 1963
- December 28, 1963
- December 29, 1963
- December 30, 1963
- December 31, 1963 (This strip ends the first full month without 5 appearing)