- December 1, 1984 (This strip is adapted in I Want a Dog for Christmas, Charlie Brown)
- December 2, 1984 (The first appearance of Wilson)
- December 3, 1984
- December 4, 1984
- December 5, 1984
- December 6, 1984
- December 7, 1984
- December 8, 1984 (A rare strip with Spike wearing a sweatband)
- December 9, 1984
- December 10, 1984
- December 11, 1984
- December 12, 1984 (The first reference to Lydia)
- December 13, 1984 (The final reference to Floyd)
- December 14, 1984
- December 15, 1984
- December 16, 1984 (Beethoven's birthday)
- December 17, 1984 (This strip and the five following strips were adapted as the segment "The Play" of the 1985 The Charlie Brown and Snoopy Show episode "Sally's Sweet Babboo" and later in It's Christmastime Again, Charlie Brown)
- December 18, 1984
- December 19, 1984
- December 20, 1984
- December 21, 1984
- December 22, 1984
- December 23, 1984 (This strip is adapted in It's Christmastime Again, Charlie Brown)
- December 24, 1984
- December 25, 1984
- December 26, 1984
- December 27, 1984
- December 28, 1984
- December 29, 1984
- December 30, 1984
- December 31, 1984
| ← November 1984 | January 1985 → |