- December 1, 1980
- December 2, 1980
- December 3, 1980
- December 4, 1980
- December 5, 1980
- December 6, 1980
- December 7, 1980
- December 8, 1980
- December 9, 1980 (This strip and the following strip are adapted in I Want a Dog for Christmas, Charlie Brown)
- December 10, 1980
- December 11, 1980
- December 12, 1980
- December 13, 1980
- December 14, 1980
- December 15, 1980
- December 16, 1980 (Beethoven's birthday)
- December 17, 1980
- December 18, 1980
- December 19. 1980
- December 20, 1980 (This strip and the following strip are adapted in It's Christmastime Again, Charlie Brown)
- December 21, 1980
- December 22, 1980
- December 23, 1980 (This strip is adapted in It's Christmastime Again, Charlie Brown and Charlie Brown's Christmas Tales)
- December 24, 1980 (This strip is adapted in Charlie Brown's Christmas Tales)
- December 25, 1980
- December 26, 1980
- December 27, 1980
- December 28, 1980
- December 29, 1980
- December 30, 1980
- December 31, 1980
| ← November 1980 | January 1981 → |