Mendelson recalled, "When we looked at the show about a month before it was to go on the air, I said, 'That's such a pretty melody; maybe we should try and find some people to put some lyrics to it.'"

[2]The vocals for the song were provided by the children's choir at St. Paul's Episcopal Church in San Rafael, California.

Club pointed to the song's juxtaposition of nostalgic lyrics and minor-key composition as a reason for its longevity: "As 'Christmastime Is Here' and the other songs from A Charlie Brown Christmas have been folded into the catalogue of enduring Christmas carols, they’ve continued to stand out by representing a particular strain of wintry melancholy.

[6] In 2015, Japanese-Australian singer-songwriter Joji sampled the standard in his 2015 trip hop song "you suck charlie".

The first person to record a cover version of the song was jazz guitarist Ron Escheté on the album Christmas Impressions (1982).

Pentatonix sang the song as a mash-up with "Pure Imagination" for their 2023 compilation album The Greatest Christmas Hits.