December 1, 1999
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December 2, 1999
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December 3, 1999
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December 4, 1999 (The final appearance of Spike's cactus)
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December 5, 1999 (The last interaction between Linus and Sally)
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December 6, 1999
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December 7, 1999
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December 8, 1999
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December 9, 1999
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December 10, 1999 (This strip is adapted in I Want a Dog for Christmas, Charlie Brown)
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December 11, 1999
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December 12, 1999 (The last interaction between Lucy and Rerun)
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December 13, 1999 (The final appearance of Lucy)
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December 14, 1999 (The day that Charles M. Schulz announced his retirement)
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December 15, 1999
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December 16, 1999
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December 17, 1999
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December 18, 1999
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December 19, 1999 (The inclusion of a detail from Washington Crossing the Delaware in this strip makes it a rare one in which adults appear)
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December 20, 1999
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December 21, 1999 (The final appearance of Spike)
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December 22, 1999
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December 23, 1999
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December 24, 1999
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December 25, 1999
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December 26, 1999
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December 27, 1999 (The final baseball-themed strip.)
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December 28, 1999 (The last interaction between Sally and Snoopy)
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December 29, 1999 (The final appearance of Snoopy as the World Famous Attorney)
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December 30, 1999 (Rare strip in which the lettering was done by another person due to Charles M. Schulz's failing health)
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December 31, 1999 (Rare strip in which the lettering of the last panel was done by computer due to Charles M. Schulz's failing health)
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← November 1999 January 2000 →
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