A list of ideas for activities and discussions:
To Do:

Sledging/ Tobogganning

Make snow angels

Snowball fight

Build a snowman

Build a snow sculpture

Catch snowflakes on your tongue

Fill empty washing-up liquid bottles and spray bottles with either diluted paint or water with a few drops of food colouring and 'paint' the snow

Make giant stencils and use the spray bottles mentioned above to make colourful snow pictures

Ski

Look for animal/ bird tracks/ spider webs

If you know snow is forecast, lay out items that won't be damaged by the cold to create patterns when you lift them up, or weigh down heavy cardboard - perhaps in a giant snowflake design?
To Discuss:
:chat: Where snow comes from and why we don't get snow in the summer
:chat: Which animals/ people live in snowy areas - polar bears, penguins, Eskimo/ Inuit, arctic fox, arctic wolf, arctic rabbit, whales, yeti......
:chat: Animals that hibernate in the winter
:chat: Countries that are snowy
:chat: Igloos - what they are made from, how they are built
:chat: How people travel on snow