Hogwarts recebeu muita neve pelo menos uma vez, e a aula continuou.

Hogwarts tinha vários metros de neve por ano, e as aulas continuavam como de costume. Alguns lugares no castelo eram frios, mas os estudantes ainda deveriam comparecer às aulas. Isso é lógico - eles não precisariam de transporte para ir à escola, já que moram lá, e como eles estariam lá e teriam que ficar do lado de dentro de qualquer maneira, eles poderiam continuar suas aulas. Como eles estariam lá de qualquer maneira, não há motivo para cancelar a aula.

“One morning in mid-December, Hogwarts woke to find itself covered in several feet of snow. The lake froze solid and the Weasley twins were punished for bewitching several snowballs so that they followed Quirrell around, bouncing off the back of his turban. The few owls that managed to battle their way through the stormy sky to deliver post had to be nursed back to health by Hagrid before they could fly off again.

No one could wait for the holidays to start. While the Gryffindor common room and the Great Hall had roaring fires, the draughty corridors had become icy and a bitter wind rattled the windows in the classrooms. Worst of all were Professor Snape’s classes down in the dungeons, where their breath rose in a mist before them and they kept as close as possible to their hot cauldrons.”
_{^{- Harry Potter and the Philosopher's Stone, Chapter 12 (The Mirror of Erised)}}

Até as aulas ao ar livre continuaram na neve.

As duas aulas ao ar livre em Hogwarts, Herbologia e Cuidado das Criaturas Mágicas, continuaram mesmo na neve pesada.

“Snow was still thick upon the grounds, and the greenhouse windows were covered in condensation so thick that they couldn’t see out of them in Herbology. Nobody was looking forward to Care of Magical Creatures much in this weather, though, as Ron said, the Skrewts would probably warm them up nicely, either by chasing them or by blasting off so forcefully that Hagrid’s cabin caught fire.”
_{^{- Harry Potter and the Goblet of Fire, Chapter 24 (Rita Skeeter’s Scoop)}}

Eles estavam menos confortáveis, mas continuaram.

“Hurry up, now, the bell rang five minutes ago,’ she barked at them, as they struggled towards her through the snow.”
_{^{- Harry Potter and the Goblet of Fire, Chapter 24 (Rita Skeeter’s Scoop)}}

Há feitiços para combater a neve, mas os professores raramente os usam.

Existem magias que ajudam com nevascas pesadas. Hermione usou um feitiço para criar ar quente para limpar a neve.

“Ignore them, just ignore them,’ intoned Hermione, pulling out her wand and performing the charm to produce hot air again, so that she could melt them an easier path through the untouched snow between them and the greenhouses.”
_{^{- Harry Potter and the Order of the Phoenix, Chapter 21 (The Eye of the Snake)}}

Quando estava nevando muito, porém, os professores e a equipe realmente não usavam medidas mágicas para limpar a neve ou aquecer o castelo.

“October extinguished itself in a rush of howling winds and driving rain and November arrived, cold as frozen iron, with hard frosts every morning and icy draughts that bit at exposed hands and faces. The skies and the ceiling of the Great Hall turned a pale, pearly grey, the mountains around Hogwarts were snowcapped, and the temperature in the castle dropped so low that many students wore their thick protective dragonskin gloves in the corridors between lessons.”
_{^{- Harry Potter and the Order of the Phoenix, Chapter 19 (The Lion and the Serpent)}}

Herbologia foi cancelada uma vez, mas apenas indiretamente devido à neve.

A herbologia foi cancelada quando a Professora Sprout estava cultivando Mandrágoras no inverno, para reviver as vítimas Petrificadas do basilisco. No entanto, isso foi porque ela queria lidar com a proteção de si mesma desde que era importante.

“By next morning, however, the snow that had begun in the night had turned into a blizzard so thick that the last Herbology lesson of term was cancelled: Professor Sprout wanted to fit socks and scarves on the Mandrakes, a tricky operation she would entrust to no one else, now that it was so important for the Mandrakes to grow quickly and revive Mrs Norris and Colin Creevey.”
_{^{- Harry Potter and the Chamber of Secrets, Chapter 11 (The Duelling Club)}}