For the first time in a many generations, a new weather has been implemented in Pokémon Scarlet & Violet. This weather is an adaptation of previous weather, Hail and is basically just a lighter version of it, snow.

Snow no longer has the damage each turn that Hail did, but instead it boosts the Defense of all Ice-type Pokémon. All moves, items and abilities that affected or required Hail now affect or require Snow instead

You can find snow normally in the Glaseado Mountains and Dalizapa Passage.

Snow Effects

Blizzard hits 100% Accuracy
Ice-type Pokémon Defense stat increased by 50%

Moves that activate Snow

Name Type Cat. PP Att. Acc. Effect
Chilly Reception Chilly Reception - ICE 10 -- 101 The user tells a chillingly bad joke before switching places with a party Pokémon in waiting. This summons a snowstorm lasting five turns.
Snowscape Snowscape - ICE 10 -- 101 The user summons a snowstorm lasting five turns. This boosts the Defense stats of Ice types.