January is the first month of the year. It is the first month of the year that contains thirty-one days.
- 1995 — Rita Skeeter's article stating that Rubeus Hagrid is a half-giant is published. Hagrid goes into hiding.
- 1992 — The Hogwarts Express returns to Hogsmeade Station bringing back the students who went home for Christmas. This is the second term of the 1991-1992 school year.
- 1996 — The Hogwarts Express brings students back to Hogwarts School after the Christmas Holidays. Harry, Ron, Hermione, Ginny, Fred, and George ride the Knight Bus to Hogsmeade. This is the second term of the 1995-1996 school year.
- 1997 — Potions master Horace Slughorn presented each of his sixth-year Potions students with a phial of this poison so that they could brew an adequate antidote under the principle of Golpalott's Third Law.
- 1960 — Severus Snape is born to Tobias and Eileen Snape.
- 1994 — Harry Potter begins his first anti-Dementor lesson with Professor Lupin.