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.

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.