|Illustration for "The Snow Queen" by Edmund Dulac, 1911|
Everard's Ride by Diana Wynne Jones
This early novella by Diana Wynne Jones is quite different from her later, better-known Chrestomanci and Howl's Moving Castle series, but it's one of my favorites of her books. I love the Victorian setting and mysterious ambience of the story, which follows siblings to a secret kingdom across a marsh. The book opens at Christmastime and takes place in the days following the holiday, and is currently published in an anthology of Jones' shorter works titled Unexpected Magic.
A Traveller in Time by Alison Uttley
When Penelope Taberner Cameron goes to stay with her great-aunt and great-uncle at their house Thackers, she finds herself slipping between the present and the house's Elizabethan past. This beautiful and thought-provoking time-travel fantasy takes place throughout various seasons, but the climax of the story falls during Christmastime.
The Snowstorm by Beryl Netherclift
Siblings Caroline, Kit, and Richard go to spend their winter holiday with their Aunt Amethyst at her house Farthingales, where they find an old snow globe that serves as a window to the past. While the book takes place after Christmas, the winter break setting makes it a cozy read for the holidays. This time-travel fantasy is unfortunately out of print, but well worth tracking down from a used book retailer or at a local library.