7 December is the 341st day of the year (342th in leap years). There are 24 days remaining.
- 1992: Hermione Granger continues brewing Polyjuice Potion in the second-floor girls' lavatory. Professor Minerva McGonagall takes the name of those staying at Hogwarts during the holidays.
- 1994: Rita Skeeter turns up at a Care of Magical Creatures lesson and takes an interest in Hagrid. Later, Hermione leads Ron and Harry down to the kitchens, where she reveals that Dobby and Winky have now come to work at Hogwarts.
- 1995: Ron and Hermione's prefect duties become more onerous: they must supervise castle decoration, patrol the corridors at night and supervise first and second years on their breaks.