If it is cold and icy - Year 4 have been learning about solids and liquids so why not go outside and investigate length of icicles
or how long it takes one to melt if you bring it inside. Be careful!
Does it take a snowball the same amount of time to melt as an icicle?
Build an igloo - is it warmer inside?
Who can build the tallest snowman competition - measure it and take a photo!