- December 1, 1978
- December 2, 1978
- December 3, 1978 (This strip is adapted in the episode "Christmas is Coming" from the 2014 French TV series Peanuts. Sally replaces Lucy)
- December 4, 1978
- December 5, 1978
- December 6, 1978
- December 7, 1978
- December 8, 1978
- December 9, 1978
- December 10, 1978
- December 11, 1978
- December 12, 1978
- December 13, 1978
- December 14, 1978
- December 15, 1978
- December 16, 1978 (Beethoven's birthday)
- December 17, 1978
- December 18, 1978
- December 19, 1978
- December 20, 1978
- December 21, 1978
- December 22, 1978
- December 23, 1978
- December 24, 1978 (This strip is adapted in the segment "The Play" from The Charlie Brown and Snoopy Show episode "Sally's Sweet Babboo")
- December 25, 1978
- December 26, 1978
- December 27, 1978 (The Little Red-Haired Girl, who had moved away in the strip from July 18, 1969, is now evidently back in the neighborhood. This strip and the following strip are adapted in the segment "Sweet Babboo!" from The Charlie Brown and Snoopy Show episode "Sally's Sweet Babboo")
- December 28, 1978
- December 29, 1978
- December 30, 1978
- December 31, 1978 (This strip ends the first full year without Franklin appearing)
| ← November 1978 | January 1979 → |