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I love this idea!  The snowman melts and children observe and measure!

British Columbia Kindergarten Social Studies and Science: Earth and Space - Surroundings "demonstrate the ability to observe their environment"The children build a snowman and then use math manipulatives to measure him before (and while) melting.

Play snow

25+ Indoor Winter Activities for Kids

Huckleberry Love: Huckleberry Life: Play Snow {Sensory Activity}My kids have been outside playing with this for hours! *It's 3 cups baking soda (I checked the original site) + cup white conditioner

If you love snow and are lucky enough to have some this winter, try these super-fun snow science experiments! Snow has never been so fun or educational!

Snow Science Experiments and Activities for Kids

Practice making predictions and observations with this simple snow science experiment.