Snow

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.